Eric Gunnerson is the most publicly vocal member of Microsoft's C# team and his blog is likely (I hope) to be a primary source for early word on Microsoft's take on C# directions, rumors, etc. If you're interested in the future of the C# language, this should definitely be on your blogroll.

When I tried to RSS subscribe, I got an error message, but replacing USERNAME with ERICGU in the URL of the RSS feed fixed it up. (Here's the correct URL for the RSS feed.)