Anyone who, like myself, loved MetalScroll in VisualStudio, knows that with WPF VS2010 it doesn't work anymore. However, there is an alternative: go to Tools, Extension Manager right now and install the Productivity Power Tools for VisualStudio if you haven't already. The Enhanced Scrollbar that is included will probably do what you want.
Next to the Full Map Mode shown above, it has two other modes you can easily switch to using a context menu. There are also some options for the scrollbar that you'll find in the usual place: the ever expanding VS Options dialog.
I think I actually like the Scroll Bar Mode best, as it looks most like a normal scrollbar with usefull pixel pointers on it. Switching to Full Map Mode is always just a right click away when I really need it.