Ok, I am testing out Windows 7 and it seems great...except it didn't recognize my printer and wouldn't let me install the driver. It errored out with:
Unable to Install Printer. The printer driver is not compatible with a policy enabled on your computer that blocks Windows NT 4.0 drivers.
Ok, the solution (as is often the case under Vista) is to disable UAC. Don't go looking for a policy setting (it isn't there that I could find and I scoured all of them), don't try to install a local port like Microsoft advices for Windows Server 2003. Just disable UAC and you are good to go.
I know this one isn't SAS related but people really rely on some tips like these when they are beating their heads against the wall.