The Flexcar website uses Mapquest. It is sub-optimal. So, instead of going to the store to buy a mop and drano and food to eat, I made my own Google saved map of the Flexcars in Berkeley.
It’s not a mashup, since I just did it manually, tabbing back and forth from Flexcar’s list. http://www.flexcar.com/default.aspx?tabid=216
I don’t know how to make a real mashup (that would take the information from the Flexcar website and do it all automatically). Regardless, I’m pretty proud of myself.