Thanks for kicking this thread off henred5. I don't know if anyone else started something similar, but I think this could be really interesting if given a chance for us all to share.
Soulcore.net - The website of Matthew Warlick a graphic designer from Texas, which I found thanks to the guys deviantart gallery. It's a well thought out site, easy to navigate, and is one of the many sites that helps give me ideas on what I should do with my own when I'm done.
DeviantART.com - Say what you will about it's user interface, navigation, and body of often times overzealous unpaid moderators, who really should be paid considering the site's making money, it's been the most effective way for me to expose myself to the work of other artists from around the world, and other brackets of art. It prevents me from ever allowing myself to fall into a comfort zone that would isolate me from art as a whole.
4Chan.org - Though sections of the site aren't work safe, and it's design is incredibly simplistic, it's another one of those sites I admire for pulling you out of your comfort zones in exposing you to new ideas, even if they're absolutely immature.