Startup Disk out of Memory, what to do?

Good Day Everyone, and thank you all for taking the time and energy to consider this most nefarious situation.  I'm not a frequent poster as I find that many out there are far more skillful than I at solving gthe problems and I am incredibly grateful that we, the Mac Community, are so involved and willing to help each other.  Thus please allow me to add my two bits:
I am running a Macbook  Air 13" Late 2010 Model with 2.13 Ghz Core 2 Duo cpu and 4 gb of RAM.  Reasonably saavy with all the assistance from everyone online.  Suddenly this past Tuesday, Nov 26 I began receiving "Out of memory" warnings along with the dreaded spinning beach ball.  No new software was installed recently and I have NOT YET upgraded to Mavericks due to all the issues we all have been reading about, especially the email stuff. That said, I have many friends who have and have not had any issues at all. 
So Running ML 10.8.5, no new software installs, and suddenly awaken from sleep Tuesday Morning to a "Out of Memory" warning.  Repaired Permissions in Disk Utility, Reparied Disk in Disk Utility, Rebuilt directory using Disk Warrior from a bootable external drive, plus a plethora of other software I like to use when issues arrise. Reset PRAM, booted into Safe Mode, same problem and then discovered that whenever I restarted magically 15.75 Gb appeared.  Then within 1 hour and sometimes less it dropped to 350mb and the warning. 
Restarted several times to verify that and since then have been searching for a solution.  Just finished reading this thread and even though it is primarily related to Mavericks, based on what I have found I would bet it is an Apple ugrade of some sort because it is happening in ML as well.
One thing that did help was to quite _ip in Activity Monitor, which controlled printing, and suddenly I'm back up to 11 Gb.  However I have made no changes to any print drivers or software in months.  The only think was the latest OS update released last week which automatically installed.  So go figure.
Thanks in advance for any ideas or suggestiong beyond what we have in the thread so far.
Best Da O

Initial easy steps to gain disk space:
- Delete all files in the Downloads folder.
- Empty the trash.
- Start iPhoto, empty its trash and restart the computer.
Deleting files:
Run a Time Machine (or other) backup since you are about to delete and move files and you may need to recover from any inadvertent mistakes or decisions.  You will need one external hard drive for your Time Machine (or other) backup and a second if you plan to offload some files.  (See suggestions for where to purchase hard drives at the end of this message.)
Then use the free application OmniDiskSweeper http://www.omnigroup.com/more to explore your volume in descending order by size so you can attack the problem from the top down, deleting the largest unwanted files first.  Delete with caution and do not delete any system files.  Remember to empty the trash after trashing the files.
Additional reference on freeing disk space:
http://pondini.org/OSX/DiskSpace.html
Offloading files:
Consider moving some of the no-often-used large files or directories to an external disk.  Use ODS again to find them.  As noted above this will be at least your second hard drive.  Your first one(s) is/are for your Time Machine (or other) backup(s).  Do not offload files onto a Time Machine disk.
Format the second drive as Mac OS Extended (journaled).  Using OWS to find large files/folders and copy them from the system drive to the external hard drive and delete them from your internal drive.
Then  > System Preferences > Time Machine > Options… > Remove the offload HD name from the exclusions list.
Now both your system disk and your external offload disk will be backed up onto your Time Machine disk.
For more about backups:
Time Machine Basics: http://support.apple.com/kb/ht1427
Most commonly used backup methods:
https://discussions.apple.com/docs/DOC-3045
Methodology to protect your data.  Backups vs. Archives.  Long-term data protection:
https://discussions.apple.com/docs/DOC-6031
From: http://www.thexlab.com/faqs/freeingspace.html
To move your iTunes Music folder to another disk or partition:
To change the location of your iTunes Music folder, carefully follow the instructions in the AppleCare® Knowledge Base document "iTunes for Mac: Moving your iTunes Music folder."Additional information can be found in iTunes Help.
http://webcache.googleusercontent.com/search?q=cache:http://www.thexlab.com/105/ 00000849.html
Laptop users may want to consider having two iTunes libraries: a small library of current favorites on their computer, while their complete library resides on an external hard drive. Utilities like iTunes Library Manager enable you to easily have multiple iTunes libraries you can use with your account.  https://www.macupdate.com/app/mac/7689/itunes-library-manager
To move your iPhoto Library folder to another disk or partition:
To move the iPhoto Library folder to a new location, employ the instructions in the AppleCare Knowledge Base document from http://support.apple.com/kb/PH2506 corresponding to the version of iPhoto you are using. Additional information can be found in iPhoto Help.
Laptop users may want to consider having two iPhoto libraries: a small library of current, favorite photographs on their computer, while their complete library, or archives of older photos are saved on an external hard drive. Utilities such as iPhoto Buddy and iPhoto Library Manager enable you to have multiple iPhoto libraries that you can use with your account.
https://www.macupdate.com/app/mac/12175/iphoto-buddy
https://www.macupdate.com/app/mac/7158/iphoto-library-manager
Hardware — Bigger disk/SSD:
If you are still tight on disk space consider larger storage.  Consider doubling you SSD capacity.  OWC sells 120, 240 and480 GB SSD upgrades for 2009 to 2012 MacBook Airs for $120 to $525 http://eshop.macsales.com/shop/SSD/OWC/ .  The 240 GB option is $265.
PlotinusVeritas gives some great suggestions for purchasing external hard drives in this thread:
https://discussions.apple.com/thread/5602141?tstart=0

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    The OP had posted this question in the iMac Intel forum.
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    Message was edited by: WZZZ
    <Hyperlink Edited by Host>

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    I have a macpro desktop computer with 8 GB of memory.
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    Do the same in other applications, such as Aperture, that have an internal Trash feature. Then restart the computer. That will temporarily free up some space.
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    See this support article for some simple ways to free up storage space.
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    Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
    Proceed further only if the problem isn't solved by the above steps.
    ODS or GP can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
    Back up all data now.
    If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
    Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
    Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
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    Launch the built-in Terminal application in any of the following ways:
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    ☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
    Paste into the Terminal window by pressing command-V. You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator. Ignore any other messages that appear in the Terminal window.
    The application window will open, eventually showing all files in all folders, sorted by size. It may take a few minutes for the app to finish scanning.
    I don't recommend that you make a habit of doing this. Don't delete anything as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
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