Google Maps displays geographic Wikipedia articles now!
The map is marked with Ws representing wikipedia articles. The location of each W is determined by the latitute/longitude coordinates on the wiki page.
It's kind of amazing how thoroughly wikipedia has colonized the world. In general, whenever I see an incredibly detailed, obscure wikipedia article, it sort of reminds me of how explorers must have felt when they found almost every corner of the earth inhabited. Wow. There are people here, too?
The problem with this particular application is that some Ws are big and some are small -- and the size seems to depend on the precision of the geotagging. My hometown is tagged superprecisely (down to hundredths of an arcsecond ), which means it's tiny on the map. This building in my hometown is the only W you see when you're zoomed out.
Or maybe that's because the building is tagged in "cityscale" units?
Update: Google seems to be following Wikipedia's own guidelines, which say (rather imprecisely) that locations should be tagged with a degree of precision appropriate to their size. (Thanks, Pete.)
Previously in mapped wikis...
(Meanwhile, Yahoo maps continues not to integrate with Flickr. Hello? Jerry? Nobody in the public knows about the flickr map. Are you trying to make your company irrelevant? Do you guys have any sort of framework for adding onto applications? Will I see font tags if I view the source?)