If you need a portable projector that won't weigh you down, the 2.9-pound Toshiba TDP-PX10U Mobile Projector ($1,499 direct) is worth a long look. It's one of the few projectors with a built-in audio system that's actually loud enough to be heard from more than 1 or 2 feet away. If you use sound in your presentations, that by itself is reason enough to put it on your short list. The DLP-based TDP-PX10U offers a native XGA (1,024-by-768) resolution. At 2.6 by 8.3 by 6.5 inches (HWD), it's physically similar to other sub-3-pound projectors, including—for example—the ViewSonic PJ260D. Either projector is small enough to fit in most briefcases, even in the soft carrying cases they come with.