The Apple iPad and Its Rivals

Notion Ink Adam, tablet, iPad, Apple
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Notion Ink Adam

With the press of a button, the 1.7-pound Adam switches from low-power e-paper to full color. Unlike the iPad, the Adam, due in June, has a camera, an HDMI port, and a memory card slot.

Cost: Unavailable at presstime; Notion Ink says it will be competitive with the iPad—so around $499.