For instance, wouldn't it be cool to be able to drag a menu control onto your design and have it render a nice ul/li menu, right out of the box? Also, you should be able to have full control over it, same as the ListView. I think this should be done with all the controls, where it makes sense. I mean, for instance, the GridView is fine like it is. It's primary use is to display data from some data source. It renders tables, and displaying data is what tables are for.
Forget CSS friendly control adapters. In my oppinion, that project died more than a year ago. The fact that this project was even started, only shows the need for new controls. I have no idea why Microsoft didn't do something about this when they prepared .NET 3.5...
So, all the controls that render layout code, e.g. Menu, Login, CreateUserWizard etc, should be re-written....