As LCD projectors have dropped in weight and price, they've quickly become the businessperson's technology of choice for making presentations to more than a few people.
When choosing an LCD projector, start by making sure it's compatible with the type of computer you have (especially important for Mac users) and the size of the images you'll be projecting. Look for a projector than can handle a full range of resolutions, from 640 x 480 VGA to 1,024 x 768 XGA.
Hold out for a model that is truly portable. Newer models weigh less than 10 pounds--significantly less than older designs. Projectors are also brighter than they were in the past, allowing you to use them even in well-lit rooms. Look for a projector that puts out at least 600 ANSI lumens for reasonable visibility.
One of the best choices on the market is NEC Technologies' Multisync LT81. For less than $4,300, you get a very bright (800 ANSI lumens) projector that can project at VGA, SVGA and XGA resolutions and can connect to both Macs and PCs. The NEC comes with a remote control and has zoom capability, which is unusual for a projector in this price range. And good news for travelers: The NEC is very transportable, weighing about 9 pounds.
If you want to go a little cheaper, the Proxima Ultralight LS1 is a good alternate. It weighs only 8.4 pounds and sells for about $3,900; it has capabilities similar to the NEC, including remote control and zoom. The only drawback is that it produces a dimmer image (600 ANSI lumens), which may make it less than ideal for presenting to larger groups.