Why is my iMac so slow now?  Ever since I did the latest system update yesterday everything takes forever.

Ever since doing the recommended system update yesterday, my iMac has been e-x-t-r-e-m-e-l-y s-l-o-w.  I get a spinning beachball with every mouse click, even just clicking on a red dot to close a window.  Any suggestions?

Try Applejack.
Download:
http://sourceforge.net/projects/applejack/
Article on using:
http://reviews.cnet.com/8301-13727_7-10334620-263.html?tag=mfiredir
It runs in single user mode. After installing (you won't see it in the Applications Folder) hold CMD-S at startup. You will get a black screen with MS-DOS like text. Just follow the prompts: type in "applejack AUTO" and it will run through the following:
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
You can also run tasks selectively and for specific users by typing in "applejack." After running in "AUTO,"  you can go back and run it again as "applejack," steps 3 & 4 only, for your user.
The first reboot will take much longer than usual, as it rebuilds caches. It may take several restarts to see the benefits. Because of the deep cache cleaning in AUTO mode some applications may tell you they are being opened for the first time.
NOT YET UPDATED FOR LION
(Adapted from post by BDAqua)
Also, try applying the 10.6.8 Combo update.
http://support.apple.com/kb/DL1399

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    <Subject Edited by Host>

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