So, I have no idea how widespread this is, but man.. that Alchemy software is awesome if you like doing speedpaints. It does a lot of groovy things that I don't really have the knowhow to explain, so I guess I'll post some media?
Secondly: Andrew Jones uses this program. And a video of him using it is even on the frontpage of that linked site. Fact: Andrew Jones is fantasticalus
.Here's a forumpost
on CA that has renowned concept artist Sparth doing stuff with the software.
And it's free! Check it out!