Love this song (THIS version) but really dont like the more poppy version (aka him on Letterman).
I have an awesome recording of him doing a live cover of 'Africa' by Toto, but couldn't find a good one on YouTube. In the recording I have, he records his voice a number of times and harmonizes with himself- its really cool.
I saw him live in '03 ('04? dont remember) at my college, and it is still one of the best concerts I've seen.