The Projection Design Action! 25 is supposedly the world's smallest 1080p projector, at "3.7 inches high, 9.2 inches deep and 10.8 inches wide." Not bad for a full HD DLP rig.
But the size, mentioned on other sites as a bragging point, could introduce some design compromise.
Does it manage to fit an optical keystone correction system into that smallish chassis? Will the smaller form factor make it a louder setup, since the airflow won't be as generous?
It also has HDMI 1.3, 10-bit color processing to go along, as well as a 5x, 7-segment color wheel.