This one goes in the "totally useless but an interesting oddity" category. At close inspection, you can see that the text on the "Q4 2008" document that's part of the Keynote '08 icon is actually the first three verses and then a few lines of a song called "The b*tch of Living" from the musical Spring Awakening (more from Wikipedia). Interesting choice of text for a document titled "Q4 2008."

[robg adds: I'll leave the lyrics search up to you, as Geeklog's censor engine makes linking to them a challenge. Although I can't read most of the words in the text on the Keynote icon, if you have the lyrics visible onscreen, it's clear that those are indeed the words being used. Who wants to wager that there might be a subtle change in the icon when the next Keynote update is released? :)]