Have you seen Google Maps? Do you play World of Warcraft? Wouldn't it be cool to navigate around the WoW world map using the slick Google Maps interface?? Yeah, I think so too... MapWoW.com has just that. They've used the Maps API and glued in the WoW world map, along with some handy information like travel paths and resource locations. Nifty!
You can decide how useful it actually is for you, but it sure is pretty sweet. Fun to tool around different places in Azeroth as seen from the orbiting satellite, I think.