Research In Motion is keeping pace in the mobile browser race with the purchase this week of Torch Mobile, maker of the WebKit-based Iris smartphone browser.

Torch Mobile, a WebKit developer that makes the Iris mobile browser, announced Monday that it has been acquired by RIM (NASDAQ: RIMM) for an undisclosed sum.

Already, observers are calling RIM's acquisition of Torch Mobile prudent on several levels, and is the first step toward making good on delivering an improved BlackBerry browser by next summer, William Stofega, mobile analyst at IDC, told InternetNews.com.

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