I think its kind of funny that we have countless preservations of the OOT taken from laserdisc and other sources, but not much has been done with Star Trek. The theatrical edition of ST:TMP was on laserdisc, and there was some talk about transferring it, but as far as I know, nobody has transferred it to DVD. There were several other Star Trek related things that also, as far as I know, never been put on DVD, such as the 25th anniversary Special, that was released on Laserdisc as well, I believe. There are probably some other things that I'm missing.