Like Beer I had no idea that this sort of thing had been done before, but going by observations made here some form of readily accessed list could be helpful to 'Catters travelling through unfamiliar territory.
BTW the 72 hour notice thing was merely an arbitrary figure plucked out of the air, and happens to be the minimum notice that we ourselves require. It would seem sensible for each listing to include the notice required along with other relevant info.
Most of us know our dates of travel months or more in advance, and planning an itinerary could be a nice way of whiling away the dark winter evenings.
Being a 'Catters setup good manners and behaviour would, of course, be a reasonable expectation. (For the consequences of falling down on this see Charmion's 28 Dec 08 - 09:59 AM post above.)