I'm sorry, Flickr.

Okay, I take back what I said about Flickr. They've done a lot of work to their site and it's actually pretty cool now (you can delete pictures, too!).

However, I'm pretty hooked on Buzznet at this point, so I don't foresee going back to Flickr anytime soon, even if their interface is usable now and their site is less cluttered than Buzznet.