Yesterday I went and photographed some pieces I had at a friend's place and added them. I've had a really good experience with this site so far. It's cool to see a lot of my pieces all in one place - usually they're in several locations across town, or in storage, or whatever.
It's also encouraged me to create more artwork. I've enjoyed creating my favorites list and finding inspiration for new techniques & directions to take my painting and printmaking.
Honestly I kind of judged a book by its cover with this site. A lot of what I saw on the front page was really shitty furry fan art, so I kind of had deviantART pegged as a social networking site for twelve-year-old furries. I think that a disproportionate amount of the artwork is furry-related, but that the average number of submissions per user is probably much higher for furries than most other uploaders.
That said, the calibre of work on the site is AWESOME!