Mike Blumenthal has uncovered a case where a computer repair company is using mass uploads to Google Maps to generate national business. While the methodology can be seen as spam, the company is offering national repair services - though it is questionable if they have offices or employees everywhere.
It is difficult to reach the company directly - their phones are manned by a service at all times, the contact info when you do a domain lookup is buffered by Domains By Proxy - who incidentally proclaim they are protectors from spammers.
As is pointed out in the Google Groups covering Google Maps the local nature of this app seems to be diverted. The listing of an 800 number and a post office box address should be two things Google blocks in the Map API.
This is starting to get some press and should be interesting to see what happens.