Just picked this sucker up yester and I'm having a blast . Kinda reminded me of my old CC3d days, but without the tear inducing calculations and cries of "why won't you rotate correctly?!". So far I've managed to make something of a very simple 3D platformer, and I plan on seeing just how far I can go with just what's available right now, although I'm quite excited for what's coming up.
BTW, to everyone fiddling with camera stuff. TiAm's MouseLock Plugin might prove handy if you haven't already gotten it