Macbook Air's hard drive full with files under the 'other' category - how do I find these files and delete them?

A few days ago a pop up message came up on my screen saying that my hard drive was full, and that I could not install valuable updates because I did not have enough space on my computer. I checked my computer's storage space only to find that 18.22GB of my hard drive was filled with files/programs under the 'other' category. I have deleted all my downloads, most of my pictures and have done virus scans and I still don't have enough room. How do I find out what is in this 'other' category so that I can delete these files (which seem to be hidden) or whatever they may be?

1. Empty Trash.
    http://support.apple.com/kb/PH10677
2. Delete "Recovered Messages", if any.
    Hold the option key down and click "Go" menu in the Finder menu bar.
    Select "Library" from the dropdown.
    Library > Mail > V2 > Mailboxes
    Delete "Recovered Messages", if any.
    Empty Trash. Restart.
3. Repair Disk
    Steps 1 through 7
    http://support.apple.com/kb/PH5836
4. For info about "Other":
    http://pondini.org/OSX/DiskSpace.html
    http://pondini.org/OSX/LionStorage.html
Best.

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