I think most people would agree that it is other sites that need to steal from deviantART, not the other way around. I'm not affiliated with deviantART in any way other than being friends with the guys over there. But let's be real, when it comes to innovation in creating virtual communities, deviantART is certainly a leader.
The article here only scratches the surface of what it's possible for users to do on dA. And even then, I'm just describing these features, to experience them is quite another.
And it's not just big things like thumbnails or journals, it's little things like having your user account be