While this was posted by me some some time ago here is an update...
Update @ February 5 : Microsoft is targeting an April '09 release of their Release Candidate (RC) build. If tests of the RC build proceeds according to plan, Microsoft is confident of launching Windows 7 before the December '09 holiday season. In short, we can expect Windows 7 to RTM by November or early December '09.
Update @ February 25 : NVIDIA let it slipped in a conference call today that Windows 7 will be out this year
. Well, the latest you can get this year is December, so our source is on target with the November-December launch window that we announced on February 5 (see above).
via Tech ARP - ED#105 : The Latest Microsoft Windows 7 Roadmap Rev. 3.0