Over at jkOnTheRun they linked to a presentation from Microsoft on best practices for using a tablet.
Most of the tips are logical and good for new users to know, but one doesn't make sense to me.
It's their second tip. Here's a screen clipping:

Say what?
I'd recommend the opposite. Use the right-button functionality as much as possible. That's what context menus are for. I've also not found that it slows down Text entry. Is that a Vista bug?