Cube World
Cube World is a new cubicle toy that consists of a number of small cubes with LCD screens on them, each showing a little person inhabiting the cube, living its own little life. The real magic happens when you attach the cubes together; the little people interact with each other spatially, walk from cube to cube, and do other interesting things. It's like a Tamagotchi for the social networking age.
Micro Mini Projector for your Mobile Phone

Light Blue Optics a path breaking company based in Cambridge has just announced its latest revolutionary product , a miniature projector. All of 62cc in volume and as small as a matchbox the projector has generated a lot of buzz and is based on the ground breaking PVPro (TM) technology. Via PVPro one can view images from mobile phones, laptops, computers and even the Video Ipod.
CES 2008: Gizmodo Interviews Bill Gates
http://gizmodo.com/341802/bill-gates-explains-the-difference-between-mic...
Bill Gates discusses the differences between Microsoft and Apple.
VideoTrace
http://www.acvt.com.au/research/videotrace/
A new Australian project allowing 3D models to be quickly sketched from video clips and then manipulated at will. Watch for the truck clone a couple minutes in.
Low-Cost Multi-point Interactive Whiteboards Using the Wiimote
Since the Wiimote can track sources of infrared (IR) light, you can track pens that have an IR led in the tip. By pointing a wiimote at a projection screen or LCD display, you can create very low-cost interactive whiteboards or tablet displays. Since the Wiimote can track upto 4 points, multiple pens can be used.
Tangible Spacetime
The Khronos Projector is probably my favourite project out there. Check out a movie or two on that page. (This is basically unrelated to mini-projectors.)