Vonage, the Internet phone service, has found itself besieged by more legal woes. A court has found it infringed on six Sprint Nextel patents, and ordered Vonage to cough up $69.5 million and a 5 percent royalty on future sales. Last March, Vonage suffered similar penalties after it was found guilty of infringing on Verizon patents. A royalty here, a royalty there, and soon you're talking serious money. [Silicon Alley Insider]