The information that has been released so far, especially Michael Barr's comments on it, suggest that this is far from the only bug.

For example, http://www.edn.com/design/automotive/4423428/Toyota-s-killer... quotes Barr's claims: "Toyota’s electronic throttle control system (ETCS) source code is of unreasonable quality." "Toyota’s source code is defective and contains bugs, including bugs that can cause unintended acceleration (UA)."

I am a little appalled at the number of apologist comments on this story. There is mounting evidence that this wasn't a "it could happen to anyone" bug, but rather a serious violation of software engineering ethics. Code must not kill.