What's new in 2?
I've started an attempt to get the various ASP.NET teams either blogging or (for me) ideally writing for MSDN about their favourite features in ASP.NET 2.0. There has been a lot written about the "Big features", but I think people are (or should be) also interested in the smaller refinements. Mike Pope has a great blog post on the changes to the controls on the "Web Controls" tab of the control palette.
And I *still* think the Substitution control is just a whacky (but incredibly neat) idea.