Greg covered Photosynth when it first went public, he described it as a “totally cool” tool that allows Windows users to upload photos, “the technology automatically “synths” them, creating a 3-D, 360-degree interactive photo collage of whatever the photographs depict.”
Microsoft has now integrated it with Live Maps and you can see live examples in Seattle, Vatican city, at the Leaning tower of Pisa and many more places. Greg Sterling posted additional screen captures at his personal blog.
In other Microsoft mapping news, they have added 41.07 TB worth of Virtual Earth imagery. The Microsoft Virtual Earth blog details exactly which locations have been updated. The images look crisp and sharp to me.