I was trying to re-visit the SpeedTree trees in Bing Maps 3D, but strangely the 3D interface of Bing Maps has disappeared. Then I found  this announcement on Bing Maps Blog.

Many comments express their concerns about the discontinuation of the 3D control, SDK licensees seemed totally surprised that 3D control is discontinued without a replacement or replacement announcement. Has Mircosoft given up to compete with Google Earth?