FAQs: http://aspalliance.com/1255_Frequently_Asked_Questions_in_NET_20

Feature changes in asp.net 2.0
http://msdn2.microsoft.com/en-us/library/aa479401.aspx

Understanding page inheritance in asp.net 2.0
http://west-wind.com/weblog/posts/3016.aspx

The Code Models of ASP.NEt 2.0 (abt partial classes) http://www.odetocode.com/Articles/406.aspx