Google has added Mapplets, extra data layers, to Google Maps.  Once at Google Maps, click on “My Maps”, then select one of the “Featured content” options, or click “Add Content” to get a list of all available content.

A few I thought were interesting:

• Gas Buddy
• Flickr Photo Mapplet
• Famous Photos
• Google Real Estate Search
• Movie Showtimes
• JamBase Concerts

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