I can’t personally vouch for any of what follows, but for Toshiba M200 owners wanting to try Vista RC1 on their Tablet PCs, this site links to info that says you can use some of the M400 drivers for Bluetooth, Tablet Buttons, Common Modules, and the Hotkey Display as well as screen rotation. Check that out here. The site, Technology, Books and Other Neat Stuff also points to why you can get Aero Glass on a M200. Apparently the M200’s Nvidia Go5200 video card which only contains 32MB of memory will allow sharing of memory with the latest Nvidia Vista drivers.
Again, I haven’t tried any of this out personally, but if I get the time this weekend, I just might.