While salivating over Fred Adelman's incredible TV Guide ads in the General Movie section, I was getting frustrated in my initial attempts to locate some of these movies in the imdb. Digging further, it would appear that a few do have listings of their own, but most have been lumped into the general heading of the late-night series ABC broadcast them under, "WIDE WORLD OF MYSTERY," and even there, some titles were still missing.
There isn't much of the history of the omnibus at the imdb page, but I think I can fathom that the bulk of these movies were shot on videotape instead of film, and that on a third of them, they were pickups from ITC's "THRILLER" series in the UK. Anyone with a better memory of this show (i.e., someone who didn't have to go to bed at 11:00 pm like I did during those years) who can flesh out the history. It looks like an intriguing, if somewhat cheap, companion piece to the beloved "ABC MOVIE OF THE WEEK."