Google Maps Crams In More Info, Wants To Tap Your Inner Lewis And Clark
http://www.techcrunch.com/2009/10/07/google-maps-crams-in-more-info-wants-to-tap-your-inner-lewis-and-clark/

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Original article
http://google-latlong.blogspot.com/2009/10/your-world-your-map.html

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Didn't read through it all, but comes down to the fact that parks and widths of roads in the usa are now added... neat job, but nothing spectacular.

In addition, it now also shows bike trails (dotted lines) and paths, college campus buildings, additional water-related features like sloughs and property survey boundaries.