Crossing SF without encountering a pandhandler would also be brilliant. I seriously doubt there's a datastore currently available to plot something like that.
There isn't and there won't because that'd be impossible to keep track of without tagging every homeless person in the city like cattle with RFID chips.
You could have a location aware smartphone app that let you hit a button to log coordinates and a timestamp for every bum you spot. Maybe a feature add-on to Trapster?
