Well, the DSi game, which I mention in the video and my blog post, uses this 3d effect. But that is also the only use I know. IR lights seem to appear as pretty bright when recorded by the N900's front camera. Someone would have to test how well tracking of IR lights works. That sounds pretty interesting and would certainly look cool, but I'm more into games than such serious stuff. Everyone: Sorry, there is nothing to install (yet). I don't know set when/if I'll publish something.