While it's a bit long, the video Evolution is a Blind Watchmaker [1] (link via Jason Kottke [2]) is a facinating look at evolution and a rather neat argument against Intelligent Design, showing how clocks could evolve, assuming the parts that make up a clock were all swimming around and actually had an affinity to combine.
And if simulated universes with evolving clocks isn't your thing, how about a few physics lectures [3] by the late and great Richard Feynman [4].
[1] http://www.youtube.com/watch?v=mcAq9bmCeR0
[2] http://www.kottke.org/remainder/08/02/14977.html