More than 500 ed-tech companies exhibited at this year's National Educational Computing Conference in Philadelphia. Here's a sampling of news from the exhibitors offering projectors and presentation tools:

InFocus Corp. demonstrated its new X3 projector, with 1,600 ANSI lumens and a 2000:1 contrast ratio. The X3 uses Dark Chip 2 Digital Light Processing (DLP) technology from Texas Instruments for sharp images that will not deteriorate over time. The projector is wireless and can be used with computers, DVD players, PDAs, satellite TV receivers, and video game consoles. It retails for $1,199.



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