Yag has compiled a list of products created by Microsoft that are developed either entirely, or just some features, with .NET code. As we can see the list contains some interesting products like UDDI server or Sharepoint Portal Server (from Windows 2003), and most important the list is increasing. At a MSDN conference here in Romania, in regards with this subject, it was said that the next version in Office will have more modules developed using .NET (this should mean no more PIAs?).
The conclusion is: Winforms is gaining momentum, which is a very good thing.