Microsoft has applied for a patent for using finger flexing to control a computer.
As discussed in the RWW article, there are many challenges to making this work. Just like with EEG, calibration of the EMG sensors and training will require innovative solutions.
It seems to me that this type of gesture-based control has quite a bit more potential than what can be obtained through the interpretation of EEG signals. In either case, the big benefit of advancements in these human-computer interface (HCI) technologies is that they could ultimately improve communications capabilities for the disabled.