Ok, I don't consider myself a fanboy for just about anything, but I'll admit that I'm a Torg fanboy, and I started working this week on a d20 Modern Torg campaign for my own personal use, (I don't have a license or own the rights to it, so I can't publish it) and will probably start it off with a bang sometime next year.
Torg is my favorite game, period. I own all the supplements (though I think I misplaced a couple that I need to replace.) and I ran two long successful Torg campaigns. Those were the most fun I've ever had. I've bought three copies of the original boxed set over the years; I wore the first one out completely, and I'm using the second one. The third is pristine, so far. I've played a lot of D&D, but I've played more Torg.
At a d20 Modern seminar at GenCon, Bill Slavicsek was gracious enough to sign the third Torg box I recently bought in the exhibition hall . (Yeah, he helped design Torg and was the head designer for d20 Modern. Bill's the man.) Ironically, before I walked up to him with my copy of the game, Bill mentioned during the seminar that part of his design work on d20 Modern benefitted from the design of Torg. In my mind, this further cements that you could design a d20 Torg that captures the cinematic cross-genre roleplaying experience of Torg, while still keeping it as a d20 Modern game.
If someone does a d20 conversion of Torg, I pray they do it justice.
(For those who wonder just what the heck Torg is, check Kansas Jim's page at
http://www.aoc.nrao.edu/~jogle/TORG/ and click on the "What is Torg?" section. Kansas Jim is the "sage" of Torg, and actually wrote a second edition of the game rules that never made it to print.)