We've already seen a bit of big news slip out ahead of RIM's earnings announcement, and the company's now dropped another bombshell itself. Former co-CEO Jim Balsillie has resigned from his position on the company's board of directors. In a statement, Balsillie said simply: "As I complete my retirement from RIM, I'm grateful for this remarkable experience and for the opportunity to have worked with outstanding professionals who helped turn a Canadian idea into a global success." As for the fourth quarter earnings, RIM is reporting revenue of $4.2 billion, down 19 percent fro