After being in beta for a couple months, Microsoft's XNA Game Studio Express has now been
released as version 1.0.
The XNA team is proud to announce the availability of the 1.0 release of XNA Game Studio Express and the XNA Framework, aimed at helping students and hobbyists build games for Windows and the Xbox 360. This release supports both Windows game development and Xbox 360 development (subscription to the XNA Creators Club is required in order to run XNA-based games on the Xbox 360)
Their
Games Technologies Center has some more information.
Way cool! It will be interesting to see if Nintendo or Sony follow suit with development tools of their own. A freely downloadable SDK for Wii games sure would be interesting.