There's a van that parks in a lot near my home labeled "SubBnb." I just looked up their website (
http://www.subbnb.com/) and they should probably be noted here, as they are a mobile luggage storage company, so you don't have to pick up and drop off your bags at the same location (you can arrange with them to meet you almost anywhere, including the airport). Interesting idea, although I wonder how reliable it is.