It's not often that we genuinely like what these big corporations are doing, so you'd better pay close attention here. We've caught wind of a Verizon patent covering the logistics of setting up and running a GPS-based classifieds service, which matches potential buyers and sellers of goods on the basis of their stated interests and location. Thus, next time you're driving by the home of a carpenter, for example, you might be alerted of his contact details should you need some woodworking done. This seems like a legitimately useful expansion on the location services already available on GPS devices, but -- as with the