Mashups for business

John L. Scott, and Coldwell Banker Bain real estate companies in the Northwest United States have some of the most impressive applications to take advantage of the mashup concept.  They make great poster children for Web 2.0 being used in the business world.  We've all (well, those of us looking for apartments in a major US city) seen the craigslist apartment finder and maps mashup but here are a businesses that are taking the concept further by not just hooking 2 other company's information together in a mashup but actually adding their own content (property photos, details) from their DB and enhancing the mashup even further.