Artician is a little more professional than deviantart (though I have an account there too, for my more personal work). The community is smaller, but made up of more designers and art students.
Very useful for anyone looking to keep an online portfolio of work, but with a limited budget and zero website-building skills (yours truly).
Photo of the day: what I wish the weather was like (taken summer 2010).
Ornö, Stockholm Archipelago, Sweden