Thesauruses can be fun!
Studying for those wretched SATs and ACTs and bored to death with Roget's? Or are you just a logophile who loves to surf the web? Then go here - The Visual Thesaurus. The graphical motif that links synonyms to the search words is nifty, and the vast amount of information contained is neatly catalogues and fun to click on. Teenagers should love it.
Hat tip to Highered Intelligence for the link. Go read his "anti-fisking" (as Joanne Jacobs so neatly puts it) of the life story of Edmund Gordon, an eminent black psychologist recently profiled in the NYT.