We're still awaiting a lot of upgrades/releases from Universal, which remains a big holdout. They do seem to be making new prints now and again (Rode had a new print of PLAYGIRL at the most recent LA NC) and others have surfaced, but nothing on disk yet.
Olive Films had a big run with a lot of Paramount titles, but that seems to have come to a screeching halt...those titles were somehow associated with Universal, and they got released, but nothing from the Universal vaults--what gives?
A comprehensive article in NC by the folks "who ought to know" would go a long way at this point. Of course, it should also take into account the "lower lower end" stuff found on Elliot's list.