Windows 7 officially goes on sale October 22, 2009. Many people installed the beta and RC versions of the operating system and have been very pleased. I too installed the early betas and eventually the RC code. I have been pleasantly surprised with all the builds. The OS is fast and responsive and the new user interface features really improve my productivity. I am running the RTM code on my laptop and a Gateway Netbook (http://www.gateway.com/systems/product/529668268.php ) and they both run great.
If you haven't dome so already checkout these videos of the new features:
What's New in Windows 7 - Videos
For those of you who work in IT check out this article from TechNet Magazine written by Bill Boswell.
The 10 Things to Do First for Windows 7