Here's something fun (by popular request, i'll put more clips up, but my webcam isn't very good, and it doesn't help that my guitar doesn't have fretboard markings either!):
I recall a bassist doing something like this, but a much more impressive version, of course. (Anyone knows which band/bassist did the bass version?) What i've done is to make a highly simplified electric version.
Its not too difficult to play, so to make this post more rewarding, I've provided the notes below, but you have to figure out the sequence in which to put the notes - hopefully this exercise helps to get you familar more with the notes.