what the song that plays at the end

It's either from Bill Hicks' Arizona Bay or Rant in E Minor albums. Both are basically just his comedy acts accompanied by some of his own music.
I recommend both.

Actually wait, someone else has answered this question in another thread. Here's the answer you're after: mikkoto82 replied Aug 26, 2012
Track is Live Spark by Andy Britton and David Goldsmith. Took me too over a year to find it out. :) Hope you enjoy it, it's on Youtube:

http://www.youtube.com/watch?v=e0td6v4KRu4