You might have already read about the cool things coming in ASP.NET 2.0. The question is there how do I be prepared for it, when I design/development in ASP.NET 1.x. Though still ASP.NET 2.0 is in development, lot of the fundamental blocks are in place.
Check out this article from MSDN Magazine on migrations tips to move ASP.NET 1.x to 2.0.