Project Natal for XBOX 360

Microsoft brought out its new technology called Project Natal that is actually marker-less motion capture system. As you can see in this video, it is just amazing. Based on estimated human's pose, a computer can respond in a different way. XBOX is a video game machine but this technology can be used other than game obviously. For example, human-computer interface, security, gesture recognition , remote control and so on. My analysis of this technology is the following. First, I believe they don't use 2D camera but 3D camera so that foreground of the user can be extracted easily. In addition, depth information is really helpful to estimate 3D pose because different poses can create same silhouette. Second, the program is run on a workstation, not on the XBOX so far. Third, it cannot estimate all of the possible poses because human body's articulation is really complicated. However, likely poses can be specified and most of the case, it is sufficient. Forth, I think it cannot do full pose estimation unless the user is facing to the camera. Handling a rotation is really difficult. I know that in this video they show a game of skateboarding. In that case, I think poses are limited in a certain range. For some games, necessary poses are limited so task become easier. Finally, I believe the user has to wear tight clothes. If the user wear a skirt or ample clothes, it fails to estimate poses correctly. Now I realized that I wrote about negative things of this system but let me make my point clear. This is just amazing technology and might change our lives. I welcome any comment for my analysis.