I’ve been really excited about Photosynth since it was first publicly demo’ed about a year ago. But now you can go and play with it yourself and explore some of Britain’s most striking buildings along the way. Photosynth is (for my money) the most exciting thing to happen to digital photography in a long time. And to show it off Microsoft has teamed up with the BBC to offer the previews at http://labs.live.com/photosynth/bbc/. Prepare to be amazed! It’s eerily good.