A good read where Marc talks about the origins of Traveller, sandbox game design style, T5, and the new digital Traveller games here...
The Black Gate (http://www.blackgate.com/)
Just finished reading this and it is damned enlightening. Highly recommended.
The little Facebook spaceship trading game he mentions at the end sounds like it could have some good potential.
great find! one of these days i'll finally get to play my copy of fifth frontier war (sigh)