500px

I just set up an account at 500px.com. It's just getting off the ground, but it looks like it will steal a lot of people away from Flickr. I've been on Flickr for a while and it's a great way to share photos, but it has stagnated, in my opinion. The look hasn't changed much over the years and the 'uploadr' utility is outdated, buggy and downright frustrating at times.
So far, 500px seems to be a lot more social and the portfolio I built on there looks good. For now, I'll be using it to showcase some of my favorite (best?) photos and keeping the number of photos low.

We'll just have to see how well the site does, but so far, I'm impressed!