New York

Just enter an addy in this HousingMaps-like Craigslist/GMap mashup to see nearby pads for rent, w/ the option to filter by methods both typical (max/min rent, # of BRs, cats/dogs, sublets, etc) and atypical, e.g., max commute time to work, which uses a surprisingly complex formula including walk time to subway, subway travel time, and walk time to work, but doesn't cover buses -- because then it would have to factor in "hoisting self out of dumpster time".