All results come straight from the Youtube API using "location=!" (iirc) parameters to only return geotagged videos.
Since geotagging isn't used that much on YouTube, a lot of "good results" don't appear. Nonetheless, here are some searches that give good mapping:
- occupy movement
- deamdau5 live (not all "artist + live" combo work well)
- parkour
- startupweekend (I just love these events)
- hackathon
If I search "New York City" on YouTube, I receive far different and probably more relevant videos than when I search "New York City" on MapsTube.
Cool idea.