For those of you who like sexy Windows desktop... um... things.
A few widgets I find useful are:
Kontent - RSS feeds; can customize them to your fav RSS feed providing websites.
The Weather - Displays the current weather, because I have to know at all times.
NoteBox - Puts a little text box on screen where you can keep notes; it saves your text.
And last of all, but obviously most important:
Gir 0.1 - Puts a little dancing Gir on your desktop that you can move around. 
Warning! These little widgets can eat around 10 megs of memory each, so I wouldn't use too many of them. They're great if your computer has 1 gig of memory or more. What's the use of all that memory if your so concerned with keeping it freed up anyways? 
~