lots of nice little upgrades. have no idea where to find a list of things - i'm just enjoying the 'discovery' period. like yesterday, dvd-player for the first time - nicely tweaked. mail's been improved, here and there. preview's much better. quick look [tapping the spacebar on a jpg or other media file] is da bomb. preview in the icons for video media is sweet, too. haven't purchase a big enough external hard-drive [yet] so I haven't bothered with Time Machine yet... nice thing was that overall it wasn't a huge sideways slam like XP to Vista [i still use XP, although if I had a spare Winbox i'd be tempted to try it...] FYI: I installed it on my Mac mini Dual Intel system ANY my old G4 12" PowerBook and it worked flawlessly. I can't yet seem to find any 'slow-down' that a more advanced OS usually causes in older systems. However, I don't do much video editing, so I might be in for a shock when i fire up Final Cut.... eeek.