Anyone know where I can get good wallpapers for my desktop? I'm using a wallpaper that is included with Vista, right now...

What sort of ones do you want? If you like landscapes, I made a thread a while ago of quite realistic ones I generated on my PC.. if not I usually just use Google Images. :-)

www.wallbase.cc


Edit, to be more elaborate:
The site is a kind of searchable database. It contains images uploaded by users as well as images pulled by a script from 4chan wallpaper and hd image boards (just don't be scared by that). Images are not put in any categories, but tagged which means that wallpapers have multiple describing words that allow for more accurate search results (unless the image is poorly tagged). There are of course many search options, global tops lists, random etc.
Wallbase has great modern design. There's plenty of room for the community, for people who want to find pictures, upload and share them, discuss on forum, help to tag wallpapers, add them to personal favourites collections.

I'm interested in all types.

I usually use this: http://wallpaperstock.net/

(search function, categories, a large number of resolutions, etc.)