I'm happy to be able to announce something that has been in the works for a fair bit of time.
MSDN documentation is generally pretty good, but it sometimes misses some important information, and it's hard to get that information where people can see it, and back to the authors.
MSDN Wiki allows comments to be added to msdn topics. I just added one to the main page for the Regex class.
Kudos to the team for making this happen.