Google Maps + Seattle real estate websites = EZAtlas.com - EZAtlas is a new real estate mashup for the city of Seattle. Although it's not yet complete this map will show you many listings, posted visually for you on a Google Map
New Google Maps Real Estate Tool for San Francisco - HousingRadar.com displays Single Family or Condo or Townhouse housing listings for San Francisco. It's not apparent where these listings are coming from, but you can link off the MLS link to view the home.
Using CommunityWalk.com for D.C. urban design (or real estate?) - The 'Rebuilding Place in the Urban Space' blog shows how CommunityWalk.com can be used by urban planners or real estate professionals to show building projects, properties or new developments. Take a look at the blog post and map.
Update: HomePriceMaps.com - This popular Google Maps real estate tool has expanded its features to include zipcode search and has updated its "Info Windows" to include localized links listing homes for sale, mortgage quotes and realtor listings in the area. Finally, how data markers are loaded has been redone to speed up performance times.
Other Google Maps Real Estate Tools and Mashups can be found here.
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