If you haven't checked this out yet, be sure to take a visit to it. Scott Guthrie has compiled a list of ASP.NET 2.0 Tips, Tricks, and Gotchas. He has compiled some of the best resources for navigating through the UI, VS 2005, AJAX, and more. Be sure to check the list out at
http://weblogs.asp.net/scottgu/pages/ASP.NET-2.0-Tips_2C00_-Tricks_2C00_-Recipes-and-Gotchas.aspx.