No really, I'm not kidding. If you have a few minutes to spare check out the Library of Congress Classification Game, which offers a timed test of your knowledge of the Library of Congress classification system (yes, it's different from the Dewey Decimal System you learned in grammar school). Sure, it sounds less than extraordinary, but it's actually a ton of fun. You pick up the books from the cart with the cursor and have to place them on the right shelf, in the correct spot in an allotted time frame. First the Library of Congress joins Flickr and now this?! I'm sensing a geek trend.