You'll love the work that MyriapodProductions is doing. Among other things they've created this lovely site, Mysteries of Vernacular. Using paper craft animation (that looks much simpler than it really is, I'm sure) artist Jessica Oreck explores the twisty tales behind some of the most interesting words in the English language. Check out their entry for "clue," below.
There's also a interesting entry about hearse and another on assassin. They're slowly building up their archive. I suggested limousine for L, but they'd already chosen a word.