i belong to this really fabulous photography group on flickr called, "so, you wanna be a professional photographer". it is such a great community with active participants and helpful information sharing. we're celebrating the first birthday of the group and you can read all of the wonderful things going on over there by visiting the blog. every day there are challenges + contests. yesterday we had to take a photo that included a cake. above is my contribution.
edited to add: in part of our celebrations, the moderators have started a lottery to join the group. find all the info. here.