I just finished watching a very nice (15 minute) demonstration video on how to build an ASP.NET Web site with Mapping capabilities using Virtual Earth (and Visual Studio). The author does this with Visual Studio 2008, but you could build the same application with Visual Studio 2005. He does a good job of limiting the demonstration to just the information that you need to get going, and he gives the link for the code download for you to use cut-and-past style into your application.
You can see the video here: Click here to view
You can download the source code here: Click here to download
~ Robert Shelton