It's been a rough few days for the market. A number of stocks took a tumble -- including Amazon (NASDAQ:AMZN), Cisco (NASDAQ:CSCO), IBM (NYSE:IBM), and Research In Motion (NASDAQ:RIMM). What should investors do? Shareholders in Sun Microsystems (NASDAQ:JAVA) just approved a reverse stock split. Should Sirius Satellite Radio (NASDAQ:SIRI) be thinking about the same? And is Guess (NYSE:GES) the answer for fashion-hungry investors? In this installment of Fool Video, Motley Fool Online Managing Editor LouAnn DiCosmo discusses some stories on the Fool radar.