There’s a great short intro to infinity from BBC’s Horizon (hey, what’s one hour compared to forever?).
The BBC un-YouTubed it since I originally posted, so here’s a different link, courtesy of AT reader ‘whizmd’:
I love these eager, brilliant Brits shaking their heads and giggling in helpless amazement at how their calculations turn out. Yes, it’s heady stuff. Could mathematicians be the new theologists?