[EricVanWyk]

That looks really pretty, but I'm a total newb when it comes to belt drives.

Can you explain it to me in a way that will allow me to teach it to a team later?

Specifically:
Why belt vs chain?
How do you tension it?
Any quick rules-of-thumb I should know about?

Or better yet, how do I tell if a belt system is good? Often, knowing if the result is good is almost as useful as knowing how to get a good result. {P=NP?}