Can someone point me to a few websites that run regular photo competitions. I really enjoy going out and taking photos and have a few that I consider worthy of the National Geographic (strictly IMO!). So I'm looking for a place I can post them and perhaps get new challenges to help inspire me to get out there.
On a similar note, I'm looking for some really good Flickr groups. When I lived in Seoul last year I was a member of a group on Flickr that was awesome, monthly competitions, an active group of members commenting on photos and in the discussion forums. What are your favs?