Startup AdKeeper allows users to click an icon on participating banner ads to store them online for future viewing. Although AdKeeper would seem to defy conventional wisdom about user attitudes toward ads, the service is based on research showing users ignore banners, mostly because they don't want to leave a website. Saved ads have a click-through rate of 3.4%, which means the "time-shifted" ads are 34 times more apt to be seen, the company said.

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