Looking for more information about VS2008 and .NET 3.5?
I suspect you might just be as there is a ton of new functionality and with the pace of everything coming out it isn’t likely that you know it all [:)]
To help learn the new stuff Microsoft has put a Visual Studio 2008 and .NET Framework 3.5 training kit together with lots of labs and presentations. Just go through the list and check what you would like to know more about.
You can download the trainings kit from here.