I don't recall seeing these before but I noticed that there were two new articles on WCF up on the .NET Framework Developer Center. The first article is by Juval Lowy on Writing Smart Clients . Juval talks about concurrency and synchronization issues in client application. These are important concepts to understand for UI-based applications because of the ugly consequences of getting threading wrong when dealing with UI. This article gives an in-depth explanation for web services of how to avoid the classic problem of non-responsive applications during a lengthy operation. The second article is by Amit Bahree and Chris Peiris on Peer-to-Peer Programming . This article covers the basics of P2P with a highlight on some of the new features when using Orcas on Vista. Read More...