I am new to the Alpha and just want to input my $0.02...
The good: Love it, can't wait to get my ATV (already in the mail) to test it there.
The Bad: crashes 7 out of 10 times while watching youtube videos... program just hangs when selecting the video and takes you back to the desktop with the generic "application stopped responding" error. It relaunches fine right away...
iMac (Intel, Aluminum- last revision)
4 GB RAM
OS X 10.5.6