Man, I loved Star Frontiers, in fact I still do. I've played a lot of Sci-Fi settings and Star Frontiers is right up there with Traveler and Star*Drive for me.
Heck, I still have the pipe dream of one day turning on the TV and seeing a commercial for Star Frontiers show, be it animated or loads of special effects, ala Babylon 5.
I'm planning on eventually running either an original system campaign of it, since I have most of my old stuff, or doing a d20 system campaign.
Either way, Star Frontiers rocks!