Dont know if this has been posted before , but here's a pretty cool and promising new engine I ran into. It deals with augmented reality , which i think is really awesome. I was very exited about Augmented reality when i first heard of it , and am looking forward to trying this engine out , if i'm approved for a beta version that is. lol.

there blender game engine version already artool kit you should try it

Checked it out a couple of days ago after reading your post and was facinated by the potentials, especially playing board games! Cool
I can see one would need a warehose to run a round in to play big games but how would you play a flight or space sim I wonder