I came across a really cool link today: http://blog.bretts.net/PermaLink,guid,87d735a0-1592-4711-860f-8a1d29c9630f.aspx on how you can use some of the new visualizer architecture with ASP.NET control development:
Fun Stuff...
- Scott
In last week I found some cool links about Visual Studio 2005 and ASP.NET 2.0: Building .NET 1.1 Projects