Spotted: phones with projectors -- Personal Projectors for Pervasive Computing

Looks like a nice survey. Picoprojectors will be a huge part of our mobile future. 

IEEE Pervasive Cmptg
Projectors are pervasive as infrastructure devices for large displays but are now also becoming available in small form factors that afford mobile personal use. This article surveys the interaction space of "projectors on the move" and reviews input and output concepts, underlying sensing challenges, and emerging applications.