For those really looking to give back, beyond just using the Windows 7 release candidate and automatically sending data to Microsoft, there's a program being put off called Windows 7 Scenario Feedback. Just head over to the website linked below, enter your information, and have at 'er.

The questions regard what you'd expect -- things like quality, when you plan to install, etc. and come in a yes/no and scale of 1-7 format. Easy stuff.

The RC's been about for about two weeks now, so it should prove a good amount of time to have formulated your collective impressions and then send them off, if that's what you're into.