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.
Among IFC's original shows is a comedy called The Whitest Kids You Know, an example of programs that DeMontreux calls "edgy, " and an equal-opportunity offender among cable networks likeComedy Central, Cartoon Network and FX.