Very cool news last night that we officially RTM'd with Windows 7 and Windows 2008 R2.
For information specific to when builds will be available, please see the official team blogs for the Windows team.
Client: http://windowsteamblog.com/
Server: http://blogs.technet.com/windowsserver/
General availbility is still set for 10.22.09 as far as I am aware and I have seen plenty of upgrade programs from various OEMs at local retailers and online. Windows 7 has some very cool features that make it a great operating system for both consumer and enterprise and I am excited to see it hit the RTM milestone.