As detailed here: http://wiki.secondlife.com/wiki/Puppeteering and here: http://avatarpuppeteering.com/
I've been rather desperate recently to see something decent like this - I've been desperate enough to start exploring puppet-like avatars made of linked sets and actually have a reasonable 20-30-ish prims being animated at around 14 fps, but those are pretty much the limits. It's jarring and nothing more than a novelty, and it seems to actually lag the sim when several of them are running
So, I kind of disagree with this. I feel like most people pick up second life and it's not immediately apparent that the game is _fun_. They walk around a bit, they notice "hey, these walk animations are pretty plain". The controls feel off, there's no way you'd play it reasonably with a joystick. So what if you can make a pretty avatar - the potential isn't immediately there. For the average person, it's going to be "Open the game, is it a game? Yes? No?" and the answer is "No." Because Second