In connection with a previous post of mine on ADO.NET 3.5 beta exam availability, ASP.NET 3.5 beta exams also runs on the same beta period.
71-562: TS: Microsoft .NET 3.5, ASP.NET Application Development
Promo Code: 562B1
Preparation Guide : http://www.microsoft.com/learning/exams/70-562.mspx
Some video tutorials here especially on new features for 3.5 and of course http://www.asp.net
Exam preparation information : http://blogs.msdn.com/gerryo/archive/2008/03/13/get-ready-for-the-asp-net-3-5-mcts-exam.aspx
I personally haven't looked deep into these yet (there's just too many things to do and learn everyday) but hey keep those brain cells working 🙂