A British mapmaker called Weller Cartographic Services has posted online a map of Beijing, with the latest structures built for the Olympics. You may need a color printer, of course, if you want to print it out.
Meanwhile, the New York Times has created a free, nifty tool to help you figure out when to watch your favorite Summer Olympic games. The tool also lets you learn more about any individual session to figure out if it's really the one worth watching. [Olympics Tracker]