I thought I'd start a thread where we can share Sims groups that we know of on deviantART. I hope that's alright.
Here's the group I'm a mod in> http://thesims2club.deviantart.com/
It's called TheSims2Club but we happily accept Sims3 related stuff too. We'd probably accept original Sims stuff but we've not had anyone try to submit anything like that before.
There's a group collaboration going on at the moment as well. Check out the group journal for details. Sadly there don't seem to be that many people taking part so if you want in then that would be great!