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Google Maps vs. MSN Virtual Earth [persistent.info]
greasemonkey
Greasemonkey is a Firefox extension which lets you to add bits of DHTML (”user scripts”) to any web page to change its behavior. In much the same way that user CSS lets you take control of a web page’s style, user scripts let you easily control any aspect of a web page’s design or interaction.
MSN Virtual Earth was released today. My contribution to the discussion is not a review, but a Greasemonkey script. Google Maps vs. MSN Virtual Earth is a simple script that adds links between the sites. Using their respective UI APIs, it transfers state between them, making it very easy to do side-by-side comparisons. With this in hand, feel free to make your own (informed) decision as to which is the mapping site for you.
