I just got an email announcing yet another game-engine-based animation tool. Check it out here:
http://nofilmschool.com/2012/07/source-filmmaker-powerful-animation-tool-valve/.
I know nothing about it, but I thought I would pass it on, as we have so many tinkerers around here who love to try out something new!
I understand there is currently a beta and that you need STEAM, whatever that is...:ermm: