And that question is: Just how long will it be before we see photo real virtual worlds come to the full? Not long says Michael Arrington linked above, and judging from this video of Everyscape's technology, a company Onder Skall covered last month, I'd say he's right.
This video, and the other, of Microsofts Photosynth, which is a similar technology used on this colab BBC project is what gets me excited about the future. It's what drives me to spend hours on this blog every day, and hours in Second Life talking to anyone that will listen about the 3D web. It's what it's all about. It's beautiful, and it's the future.