Scott Guthrie, GM .Net group in Microsoft announced that the source code for .Net framework 3.5 will be released to the community with *full comments*. This will be for reference and debugging purposes only. Check out his blog here.
Now isn't this great news?
I think that is pretty sweet - although with an announcement like this, there's been some blog traffic out there suggesting some don't welcome this.
I think the way it's being released makes it pretty sweet...kind of a neat feature for VS 2008.