If you're not hip to the lingo, Indigo is the communication stack that will be native to Longhorn and made available for Windows XP and Server 2003.
In completely unrelated news, Dave Chappelle checked himself into a mental health institution in South Africa.
To make things even more confusing, there's yet another Dave Chappell out there --one who's keen on Enterprise Service Buses (ESB). The David Chappell I saw tonight isn't quite so keen on ESB, as its definition is somewhat nebulous.
In short, excellent presentation on a very intriguing topic that will definitely make a difference in the lives of developers.