Originally Posted by HDTV1080P24 The 1080P/24 feature is a minor feature that is only useful if one owns a BLU-RAY, HD-DVD, or dual format player that outputs 1080P/24. If one is only interested in watching 1080I and 720P programming from over the air broadcast, satellite, or cable then there is no reason to own a 1080P display that properly displays 1080P/24 source material.
While the rest of your explanation is very helpful, I have to disagree with what you've said about 24 fps displays ONLY being useful for Blu-Ray or HD-DVD.
I've got an Anthem Statement D2 pre-pro with built-in video processor that can recognize 24 fps film sourced video from standard DVDs as well as 720p/1080i broadcast/satellite/cable, and convert it to 1080p/24 output. (This is more than just the 3:2 pull-down commonly used with conversion to 1080p/60.) I use a JVC DLA-RS1 (same as JVC DLA-HD1) front projector that accepts native 24fps, and it adds a very pleasing "film-like" look to standard DVDs and broadcast programming that originated as film. There may be other video processors/scalers that do this as well, if not now, but in the future. You can most easily see the difference when viewing scrolling film credits at the end of a movie; the motion is much smoother (just like at the theater).
So having a video display/projector that can properly accept 1080p/24 and display it as an integer multiple of 24fps is definitely a useful feature even if you're not getting a high-def optical disk player.