From the Windows Blog:

There certainly has been a lot of discussion about Windows 7 in the last few weeks. A lot of folks want to know when they can get their hands on the official RC, when we are going to RTM, and what I had for breakfast.

I’m pleased to share that the RC is on track for April 30th for  download by MSDN and TechNet subscribers. Broader, public availability will begin on May 5th.

http://windowsteamblog.com/blogs/windows7/archive/2009/04/24/windows-7-release-candidate-update.aspx