FanArtReview.com - Post your art, photos, or digital art on this art sharing site.:

I actually discovered this one through a Google Ad on this site - handy!

FanArtReview is a site that runs a whole bunch of competitions every month, as well as allowing you to upload your images for peer review. This can be a great way to get feedback and critique, especially if you don't have a local group of photographic peers.

You can sign up for free and review other people's work (a great way to get you thinking about photographs in a critical fashion, something that can be hard to do with your own shots), or you can pay for a membership and submit your work for review.