Dangerous RIM has a sharp edge

The Globe and Mail - Research In Motion (RIM-T72.38-1.03-1.40%) shareholders got tossed into a meat grinder last week, after quarterly earnings triggered a massive decline. The stock has dropped more than 20% in the last four trading days, despite end-of-quarter mark-up pressure, and is back to mid-July levels. In other words, it has given up nearly every penny of the summer rally.