Toshiba had a really light little projector at the digital life show.
The Toshiba TDP-P7U projects at 1024 x 768 (XGA) resolution with 1100 lumens brightness and a contrast ratio of 200:1, but it only weighs 2.9 pounds.
The Toshiba TDP-P7U is 7.3″ x 6.9″ x 1.8″, and connects to your PC via USB, RCA, D-Sub, S-Video and just about anything else you can think of. If you want one it will set you back about $1899.
Press release and photos below.