Windows 7 RC installed on old laptop

I've just installed the Windows 7 Release Candidate onto a friend's son's old Dell Latitude D600 laptop. The only problem was no DVD drive on this old hardware (CD only). Once I worked out how to boot from a USB thumb drive, installation was easy. It's amazing how well Windows 7 runs on old, low spec hardware. You wouldn't have a chance getting Vista to run on the same machine.