Here's a quick guide from Microsoft for anyone who's looking to migrate from Asp.Net 1.1 to 2.0. It gives you a quick run down of things you need to watch out for.
http://download.microsoft.com/download/5/0/7/507c9d3b-aa04-467f-a801-0215da7cfef5/ASPNET%20Migration.ppt
If the link doesn't work let me know I'll post the file in my blog.