The difference between the two, for the most part, lies in the user interface that they've each created for finding and recording programs -- Tivo will recommend new programs based on what you say you like and dislike, while Replay creates categories of programs (comedy, for instance) for browsing.

CNN: Analysis: Consumers have yet to buy into interactive TV

Like most other psychiatrists, I dislike Xanax for this reason and will often try to switch long-term Xanax users to one of the other benzodiazepines that has a longer half-life and less liability for producing patterns of rising and falling anxiety across the day.

CNN: What are the long-term brain effects of Xanax?