If you like watching pie fights, this is equally entertaining: Broadcom is suing Qualcomm over its patent practices. Both companies sell wireless chips, but Qualcomm also makes money by licensing its patents to the same customers who buy its chips. Broadcom, in essense, is accusing Qualcomm of double-charging customers — mostly cell-phone makers. What's not clear: Why Broadcom, rather than Qualcomm's customers, is filing the complaint. [WSJ ]