Pretty self-explanatory. I've joined CGHub.com for professional networking and inspiration. I joined ConceptArt.org to submit my stuff for crit and help others where I can. ConceptArt.org also has weekly comps for characters, creatures, environments, and industrial design. Needless to say, I'll be working mainly in the environment section, but I might change it up if there are some interesting propositions in the others. I think the next environment one starts tomorrow. I'm stoked!
Oh, and just in case any of you use these sites, my S/N on both is "Okcyde." It's my go-to moniker for most of my online presences. If anyone is so inclined, please post your S/N's in a comment, so I know my buds when I see 'em.