A few interesting ASP.NET 2.0 links
Changes in code behind and deployment for ASP.NET 2.0
File upload improvements in ASP.NET 2.0
For compatibility with 1.1 ASP.NET projects, Microsoft released a preview of a new Visual Studio 2005 project model for web application which mirrors the functionality in Visual Studio 2003. With this, web projects include only files specifically listed in your project (not all files in the directory), and all code is compiled to a single assembly.