I just tried it out with Eric, and it worked like a charm. 

Connect with up to 15 people in different locations and get your point across by showing them what's on your screen. Share, review, and update documents with multiple people in real time.A Windows Live ID (Passport, Hotmail, or MSN) is required to start sessions, but not to join sessions. New in Beta2: now even easier to use, with group chat and performance improvements!

Download details: Microsoft SharedView Beta2

I think I'll use it as a support tool when my dad has computer probs. Problem is, it's usually his broadband connection that is the source of the problem... :)