MasterPages and Nils Gruson
Thanks Nils! I was having problems with a MasterPage layout and could not figure out what was going on. VS.NET kept telling me "Could not match '...' with any ContentPlaceHolder". Despite the fact that there was indeed a ContentPlaceHolder with the proper ID. I gave up and Googled. Although blogger Nils Gruson has but one blog post, it was exactly what I was looking for!
It seems that Microsoft is aware of the problem (it was reported back in Beta 1). As noted in Nils post, just use a regular HTML table for now.