I am always looking for plot ideas and inspiration for games. I found The Evil Overlord Devises a Plot via del.icio.us and thought it amusing as well as useful.
I have also mined TV Tropes Wiki for ideas.
One of my favorite sources on this subject of all time (both for material and humor) is the Thirty-Four Firefly Episodes Based on Elton John Song Titles.
Thanks for the link. I had seen something somewhere for using song lyrics for plots. This provides excellent examples.