Microsoft XNA Game Studio Express 1.0 RTM
I'm probably the last person to blog about it but the XNA Game Studio Express if RTM and available to download.
After I Installed* it the first thing I did was turning on my xbox 360, download the XNA Launcher and purchase the subscriptions for XNA. Then I wrote a small game sample and ran it on the xbox360!!! It is so cool that I can remote debug my xbox 360 :-) This is just FUN FUN FUN!!!.