An Overview Of The New Services, Controls, And Features In ASP.NET 2.0
I you need a resume on ASP.NET 2 features, look at this MSDN article : http://msdn.microsoft.com/msdnmag/issues/06/00/ASPNET20Overview/default.aspx

Security enhancements on .NET 2.0
http://msdn.microsoft.com/msdnmag/issues/06/00/SecurityBriefs/default.aspx

Tools every C# developer should know about
http://geekswithblogs.net/gyoung/archive/2006/01/26/67191.aspx