After installing VAssistX, my Xbox XDK tools menu moved into the "VAssistX" menu. At first I thought I lost the menu but it appears to have moved with your install. Not a major concern but I figured I'd let you know.
-tom
Example: was Tools->Xbox Surface Viewer now VAssistX->Tools->Xbox Surface Viewer
I noticed this as well when I installed a PowerToy for VS.Net http://www.gotdotnet.com/team/ide/. I can't remember which one but it put the "Tool" in the Visual Assist X Tools menu instead of the VS.Net Tools menu. It's something about the Tools menu.
We are working on a revamp of our toolbars, shortcuts and menu in VS.NET. We will look at the problem and see if we can issue a fix when the revamp is released. We expect that to happen in the next couple of builds.