I was thinking about blogging about the different (reduced) user interface customizations in the new WPF-based toolbars of Visual Studio 2010 (the most noticeable, the totally modal Customize dialog) but I have learned today that someone else was more exhaustive reporting them to Microsoft Connect back in the Beta 2 timeframe:

Limited ability to customize VS 2010 Beta 2 IDE
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=511327