This morning, I was browsing the new projects page on CodePlex and noticed something nice! The ASP.NET MVC team already rumoured around making the ASP.NET MVC framework source code available on CodePlex, but here it is: the ASP.NET MVC project on CodePlex.
The CodePlex project does not allow people to make their own contributions, but you can easily look under the hood or fix bugs for your production environment. How cool is that!
Update 4:45 PM: Seems like I've stolen the thunder from Scott Guthrie :-) To be complete: the official announcement was made a little bit later than my unofficial announcement. You can read about it here.