Wallpaper Fun
I like desktop wallpaper. I always make them for the bands I'm in. Good ones are hard to find.
When I first switched to the Mac, I was enamored with the way you could constantly shift your desktop wallpaper to different images. Every 30 minutes -- boom, different desktop. It's totally integrated, and the fadeout transition is pretty nifty.
Here's a link to Wallpaper Changer for Windows XP, which does the same thing. It's a little clunkier. I found it last week and have been enjoying it at work.
Oddly, I HATE Webshots. Mostly I just don't think their pictures are all that great. I prefer to find or create my own than to have someone else arbitrarily shove their idyllic portrait of outdoor life down my throat.
For more fun, here's some wallpapers (11MB zip) I downloaded from Hubblesite. They're all the 1280x1024 wallpapers that are available from their website. I think, since they offer them for free, that it's OK to put them here to download. If not, somebody let me know and I'll post links instead. It took me 30 minutes or so to go through and get them all though so I figured I would save everyone some time. Enjoy.