Compaq Computer, Epson and Toshiba have unveiled new portable projectors at the Comdex trade show in Las Vegas, but they aren't cheap. The Epson PowerLite 7700p ups the ante for brightness to 3,000 lumens. But at 15.2 pounds and selling for $11,999, the new projector is no lightweight. Toshiba showed off three new projectors, the TPD-T1, TPD-S2 and TPD-P3. The three projectors weigh less than 7 pounds each, but at 1,000 lumens are not nearly as bright as Epson's. Their price ranges from $3,500 to $5,300. Compaq chose to focus on weight rather than brightness. At 900 lumens, the new MP2800 portable projector trails behind the Epson and Toshiba models. But at 3 pounds, the MP2800 is one of the smallest projectors on the market. The device sells for about $5,000. Portable projectors can be used to display content from laptops, as well as DVD movies and output from VCRs and camcorders.