The Web has gone map mad. Ever since Google (nasdaq: GOOG - news - people ) released easy-to-use software tools for its nifty on-screen maps of streets and satellite images a year ago, fans have set off an explosion of creative overlaps, adding their own useful and sometimes quirky data.

One map locates dog-friendly hotels in the U.S., another tracks taco trucks in Seattle (with photos and health inspection records of the trucks). A map of upcoming Native American powwows marks each site with a blue eagle feather instead of a virtual pushpin. The Gawker Stalker map of celebrity sightings in Manhattan got George Clooney so mad he urged people to flood the site with fake posts, Gawker says.

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