Viewbug describes itself as a community which awards, promotes and shares photography. I stumbled across it clicking around the Internet one night. After checking out post and pictures from other members I registered for a free membership.
One of the things I really like about Viewbug is the contest, not for the prizes (although they are pretty nice) but because the topics for the contest really challenge creative thinking. Check out the titles for some of these contest:
Letters Photo Contest
I joined last year and the site is very secure, so you should have no worries about storing and sharing your photography.