At least some of us on the IIS team are starting to get up to speed with twitter ... it's a fascinating way to interact in a very public way with other folks in a massive stream of consciousness.
As a test lead on the team, I find it a great way to find bugs that customers are having but are unable to call Microsoft or post to our forums on iis.net ... I've already got a bug for the next version of windows to make a better setup experience happen for certain scenarios. My tweets can be seen here: http://twitter.com/IISTester
Other IIS / Microsoft folks are also on Twitter ...
kjsingla - a developer who knows a LOT about FastCGI and PHP on IIS
rakkimk - a support engineer for ASP.NET
ruslany - a PM who works on FastCGI/PHP for IIS
tobint - a Technical Writer who used to write for IIS, now works on MSDN