This thread isn't getting much action, so I thought I would throw in a compliment to 5g24 as well. Aside from sleep issues, the work in progress dvd player, and a couple minor quirks this build is awesome and has been 100% stable thus far. Tremendous speed improvements across the board, and substantial amounts of polish to many preference panels and applications. My Titanium 500 is fairly comparable in speed running this build with my 867 QuickSilver running the stock build (4R14). (At least in terms of responsiveness in the interface, benchmarks would obviously show otherwise.) I love the new status indicators (is there a name for these?) on the right of the menu bar; excellent improvement. Although I thought the dockling battery meter was visually pleasant, function over eye-candy was a good choice in this instance as 40 items in the dock tends to get a little small on a 15.2" screen.
I've been logging 8-12 hours a day of OS X use since the public beta (no classic unless I need it to run an installer). I can honestly say that 10.1 is going to be a huge success. With 5G24 I chose a clean install, and haven't yet added OS 9 back on the drive (and hopefully won't at all).
The only request I still have for OS X is for some way to have grouped sets of icons in the dock. Even on a 22" Cinema Display, a crowded dock is hard to organize nicely. Muscle memory learns where all the icons are, but it would still be nice to group games, development, office, etc. in some form of categories. Maybe a nice dockling which represents a given category and when you mouse over it, a horizontal submenu fluidly animates out of it to show a set of icons somewhat like the original dock? Or how about a dockling with 4 'mini' icons and when you click a quadrant, it replaces all the icons in your dock with a given set defined in some preference window? If anyone knows where the aliases for docked items is stored, maybe I'll whip something up pending interest for it.