Greg Sterling at Search Engine Land has an
interview with Google's Director of Product Management for Local, Carter Maslan about MapSpam, that is inappropriate listings appearing in local searches. Bottom line: they are working on it. Most interesting comment:
SEL: What about cases where people want to appear in results for areas where they don't have a physical location (e.g., a "service area"). Is Google going to address that scenario?
CM: Yes, we will. We currently don't allow for service areas, but we recognize that many businesses don't have physical locations and are working to accommodate those businesses. We recommend that businesses without a physical location register themselves as a single business listing using a PO Box.