So after trying about 30 flashes, it works perfectly if you create a root of 45 megs on a 750.
Any larger and it won't work. Smaller and you won't have much fun.
If you repartition to 45 megs, then it works flawlessly, YMMV. You can repartition under the NAND Utilities Option in the new Installer.
NEW TIP: Suspend: Suspend with the "Suspend" command in the Start menu. resume with the ADDRESS key. Using the power button causes some loop that I can't stop- Z wakes and sleeps, wakes and sleeps.
One thing I noticed, regarding the reboots: if you are rebooting and have to get back to the Boot Menu, say for instance, after you've repartitioned root... you hit Enter when it asks and it starts to reboot. If you wait till the screen dims and push the OK key, you can pop right into the Boot Menu and don't have to pull the battery. This saved me a lot of time.
-andy