I was literally down to hours before the Beta copy of Win7 that I’ve been running on my primary home machine was about to expire – I did my backup and decided to go for it. 

Originally, I was under the impression that I couldn’t make the upgrade without having to re-install everything but after doing a little searching around, found that it is indeed possible – with a little bit of file manipulation – to do the upgrade from Beta to RC – and it’s even (somewhat tangentially) approved by Microsoft. 

SO, Kudos to the Win7 development team – it appears to have worked very well… of course, time will tell.

When RTM comes out, though, I will be doing a clean install then – good excuse to buy a new, bigger, hard drive.