Apple has released several updates to its printer drivers for Mac OS X 10.6 Snow Leopard. The updates include the latest drivers for printers from HP (version 2.4.1) and Epson (version 2.4). More information on installing printer software updates, including a list of supported printers, is available on Apple's Web site. (Free, 387.47/737.48 MB)
Enter Dashboard, Expose, or Spaces Temporarily
Hold down F9, F10, F11, or F12 (or whatever you've set for the Expose and Spaces keyboard shortcuts) for a few seconds, and then release the key to enter and leave the appropriate mode without having to press the key again. This is particularly useful for Dashboard, in which you can check the contents of a widget and then return to your work with only a single key press.
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HP/Epson Printer Drivers 2.4.1/2.4 for Mac OS X 10.6
Record anything on your Mac's screen, including videos.
Export to Mail, iPhoto, Messages, Twitter, Facebook, and more.
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On a happy note, this update finally fixed a small issue I was having with my P1006 (where photos would print as if somehow magically down-sampled to 32 or 24 colors). Huzzah.
For simpler, third-party apps, I just make an archive of the current app and any prefs (although that file seldom changes) BEFORE installing the update. If things "go south" all I have to do is delete the new file and un-archive the old on. It's usually much, much more difficult to to use this method for SU stuff, files could be being updated all over the OS... ;-)