Widget Watch: Capture
Here's a handy Dashboard widget that gives you some nice options for creating screen captures. Capture by VanillaSoap Design allows you to produce a screenshot, with or without the Dashboard visible, as a JPEG, TIFF, PNG, JP2, PICT, BMP, QTIF or PSD file. You can select your save location (including the clipboard), automatically resize your shot and more. Shoot the whole screen or just a selection.
VanillaSoap as a few other decent widgets available, like a bittorrent widget called BitSticks and a few games like Snake and Solitaire. Check them out.