AndrewW kind of touched on this in his "Complete Spacebuilder's Handbook" post, but what I'd like to see is an update of the "Fire, Fusion and Steel" book. (The TNE version, not the T4 edition.) What I liked about it is that it didn't just present the rules, it explained the science behind them. It also presented many alternative technologies, and explained, for some of the more far-fetched, why they wouldn't work in a realistic setting.
I also liked that it covered everything, not just ships and vehicles. It even had design sequences for small arms! A book like this would go a long way toward turning Traveller into the generic SF RPG that seems to be what Mongoose is shooting for.
I also liked that it covered everything, not just ships and vehicles. It even had design sequences for small arms! A book like this would go a long way toward turning Traveller into the generic SF RPG that seems to be what Mongoose is shooting for.