This was a frutrating one, and since 2.0 is so new, I couldn't find anything about this on the web.  But eventually, I figured it out...

The answer is that you can not specify the web.sitemap in the data source controls.  It is actually the default, and ASP.Net 2.0 selects this automaically.  If you try to tell it specifically to look for the default it has an stroke.  Hope this helps.

Free courses are still available here.

But they will not be around for much longer. If you are scheduled to take a beta exam, I imagine these course will be VERY useful for you. Go there now - it's free.

One caveat. The course is only available for 30 days after you sign up. So don't sign up for all of them at once.