I’ve just signed up at 500px.com. It’s a bit like flickr but somehow has managed to keep the quality up, although there is no editing as far as I can tell. Overall, it seems easier to use, more intuitive, faster, cleaner and not quite so cluttered as flickr has become. Also, with flickr it’s a bit too easy to get positive comments and I’ve found it’s turned into a mutual back slapping excercise; join our group and comment on 2 photos and we’ll comment on yours – a sort of pyramid comments scheme!
Anyway, here’s a link to my page and the 500px.com site: