Digital spending includes e-mail, video advertising, display ads and search marketing.

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Paid search now represents 47% of the Web ad market, followed by display ads, including banners and digital video, at 36%, and classifieds 11%, according to the Internet Advertising Bureau.

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Not only does it play back MP3 music files, but it also can record live audio and shoot and display digital still photos and MPEG-4 video.

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One display shows a video reconstruction of the sculptures in their original cave settings, which, like the digital Dunhuang cave, gives visitors the illusion of being inside the environment.

BBC: Digital Chinese caves preserve history

This week, for example, No. 3 wireless carrier Sprint Nextel unveiled a new smart phone called the Sprint Mogul, which sports features similar to the iPhone: a large touchscreen display, wireless e-mail, a digital camera, wi-fi hotspot access and music and video playback functions.

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