I have been using Windows 7 Pro x86 off of MSDNAA for a few weeks now on my Toshiba Satellite A215-S4747. I was surprised that all of the drivers worked out of the box, but I found that every 3rd reboot or so the system would lock up at the password login screen. The mouse would not move and the keyboard did nothing. The cursor was stuck and wasn't blinking in the login dialog.
Last night I decided to reinstall but with the 64-bit version instead just to see how it would go. It turns out that Toshiba decided to get all of the drivers together for the 64-bit version of 7 so right out of the box everything worked except for the SD card reader. I was able to go to the Toshiba driver page and download the "XP/Vista" drivers for the TI Card Reader and they worked just fine in Windows 7 64-bit. But after a few reboots I have found that the system still locks up every 3 or so reboots. One other thing that I noticed is the Synaptics mouse driver that it installs doesn't support scrolling using the touchpad.
I decided to go ahead and download the latest ATI Drivers from the ATI website and I was able to install them without any problem. I also installed the audio drivers from the Toshiba site and the acoustic silencer for the DVD drive. After I installed the ATI drivers the problem with locking up at startup was fixed.