I've installed the software 3 times and my magic mouse still doesn't do any of the new scrolling gestures. It's just a two button mouse right now. Apple needs to get these things right before releasing them to the public. How much did I spend for this thing?
Go to the apple blogs and see people complaining:
http://discussions.apple.com/thread.jspa?threadID=2215791&tstart=0
Apple Wireless Mouse Software Update
For the Magic Mouse.
Version: 1.0