I've been upgrading theSpoke.net to the .NET Framework 2.0 using Visual Studio 2005 RTM lately and there were a number of methods and properties that were removed (broke the build).
Asking around, I ran across the API differences between Beta2 and RTM. I found it extremely useful.
Here's the file: Beta2RTMAPI.msi (256 KB)
It unpacks a few Excel files easily displaying what has been removed and added between the two.