This seemed pretty cool...

"Microsoft Location Finder is a client-side application that turns a regular WiFi enabled laptop, Tablet or PC into a location determining device without the addition of any separate hardware. When launched by a user, Microsoft Location Finder uses WiFi access points - or reverse IP lookup when WiFi is not available - to center and display the person's location on an MSN Virtual Earth map, enabling the user to quickly and easily search in their present location."

http://www.microsoft.com/downloads/details.aspx?FamilyID=B5E8C83A-EA8E-4464-9980-7B6A8DD1013C&displaylang=en

I wonder if the MSN Virtual Earth guys have thought about a Media Center app yet?