There is certainly a lot of interest today in mapping technologies and services as developers look to create new mashups using geospatial data.  The following resources should help you get started in this area.

Virtual Earth

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SDK
http://dev.live.com/virtualearth/sdk

.chm
http://www.microsoft.com/downloads/details.aspx?FamilyID=24e08cbd-8875-4368-b4fc-cbc210d4ce72&DisplayLang=en

API
http://msdn2.microsoft.com/en-us/library/bb429619.aspx

Developer Center
http://msdn2.microsoft.com/en-us/virtualearth/default.aspx

MapPoint Web Service

Home Page
http://www.microsoft.com/mappoint/products/webservice/default.mspx

SDK
http://msdn2.microsoft.com/en-us/library/aa496073.aspx

Developer Center (same as virtual earth)
http://msdn2.microsoft.com/en-us/virtualearth/default.aspx