I just saw some mail internally where folks were looking for a list of the breaking changes between .NET Framework 1.1 and 2.0… As you likely know we work *very* hard to ensure that your V1.1 apps will this just work on 2.0, but none-the-less, this doc is likely worth a quick scan as you migrate to 2.0
http://msdn.microsoft.com/netframework/programming/breakingchanges/
Update (4/2009):
More details here: Migrating from .NET Framework v1.x to Visual Studio 2008
The updated references are:
· Microsoft .NET Framework 1.1 and 2.0 Compatibilityhttp://msdn.microsoft.com/en-gb/library/ms994381.aspx
· Compatibility Testing Scenarioshttp://msdn.microsoft.com/en-gb/library/ms994387.aspx
· List of Breaking Changeshttp://msdn.microsoft.com/en-gb/library/ms994364.aspx
· Runtime Breaking Changeshttp://msdn.microsoft.com/en-gb/netframework/aa497239.aspx
· Design-Time Breaking Changeshttp://msdn.microsoft.com/en-gb/netframework/aa570327.aspx
· Application compatibility MSDN forumhttp://forums.microsoft.com/msdn/default.aspx?siteid=1