A little more specialized, of course... but a great place to be active, especially if you're looking to connect with artists who might be able to supply your cover art / website art needs...
I'm at mrwootton.deviantart.com, and I'll "watch" anyone who "watches" me =)
I completely forgot about DeviantArt. Thank you for reminding me about this site. I used it years ago, when I was getting into 3d graphics design. It is a great place.