Update @ 3:30pm
(11/2): Because there’s been confusion on this announcement, we want to make
clear that this announcement was around the end of life of the 3D Map control.
3D Maps is not based on Silverlight and this announcement has nothing to do with
our commitment to Silverlight. We continue to invest in Silverlight
functionality, which delivers the richest possible experience for our users –
specifically through our map apps that run in the browser on the PC and the
Silverlight map control for Windows Phone 7 applications.

A bit old but still helpful to remove some of the misunderstandings around Bing committment to Silverlight.