The title of the post says it all. The launcher is available on Alldroid, hacked and put up by a user there. You just install it, and it works. I have yet to notice any real negatives in functionality - it is as smooth as the 2.0.1 Milestone launcher, and it gives you 5 home screens. It has not crashed.
I don't really know if I like the new app drawer, though. It is pretty, but it is slower than the old one and doesn't show as much per "flick". You have to recreate your old widgets, and you'll lose all of the icons on the home (you just have to put them back).