Dennis van der Stelt's WCF articles
Dennis van der Stelt posted some fine articles about Microsoft's new way of doing communication between applications and services: WCF, how to get started and some background info behind the various elements of WCF. Highly recommended for anyone who wants to know more about WCF, which is now part of .NET 3.0 which has been released last week.
As it is a series of articles, which is still in progress, you should start with part 0 and move on to part 1 etc. using the following links: