Now here's a really big screen. Projector maker Optoma introduced its HDBV3100 Bigvizion, a 100-inch 1080p DLP rear-projection HDTV that the company suggests you mount inside the wall. That better be a fairly thick wall because it requires 30 inches of depth. It's got all the usual suspects for connectivity including HDMI, it uses the latest DarkChip 3 DLP, and Optoma claims it has a contrast ratio of 10,000:1. Get together some of your strongest friends to install it, though—this sucker's shipping weight is 750 pounds.

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