SAN JOSE, Calif. -- People who gleefully treated themselves or others to a shiny new ReplayTV digital video recorder this Christmas may not be as happy anymore. DVRs are the latest alternative to VCRs, and an untold number of customers recently took advantage of ReplayTV's dramatic price drop to $149 for its lowest-end 40-hour model, thinking the deal included three years of service, which is needed for the devices to work. Now, some are furious, after their service was disconnected and they were told they must pay additional fees to reactivate it. "It's almost like buying a car and having...