I'd be interested in seeing if anyone wants to help build a tool that
lets you Tweet a picture of "art" around Baltimore from your mobile
phone which then automatically puts that picture-marker on a citywide
map.
I was tipped off from @djsunlight of Sunlight Labs about
http://TheArtAround.us,
which is a map of art around DC. That app only lets you submit via
their website, which isn't as fun.
Second step would be to be able to turn on/off a crime layer on the
map and potentially see if art effects crime.