Briefly, Photosynth was used in an episode of CSI. Very cool!
Update: CBS, which produces CSI, has a pretty rich online experiece for the show. Apparantly you can watch the latest episode including Photosynth right here. I'm waiting for the episode to start streaming, but as I'm in Japan, I suspect it isn't going to happen. Let me know if you have any luck!
Below is a pic from the episode provided by USA today.