Please check out my boss Jeff Braaten's blog regarding our new client help viewer now shipping with VS 2010 SP1 Beta. You can find some info there on installing the SP1 and how best to explore the new viewer experience if you've been using some other alternatives, like Helpware's H3Viewer.
You can download and install Visual Studio 2010 SP1 from here.
You can also check out the video I posted about SP1 Help Viewer recently here.
Try it out and let us know what you think! We're getting there, a step at a time!