Psion's Review should answer most of your questions:
http://enworld.cyberstreet.com/reviews/index.php?sub=yes&where=active&reviewer=Psion&product=trav
If your even more lazy than me, here are some snippet:
1) "Humans have the standard array of abilities that they do in the core rules. Other races include:
- Vargr: Vargr are a race of genetically engineered canines. Like the humans scattered about the galaxy, the vargr were likewise taken from earth. But the vargr were engineered by the ancients. Vargr are dextrous and have excellent senses, but are not as strong and tough as humans.
- Aslan: Aslan are descended from carnivores and are thought by humans to be lion-like, but are not connected to earthly lifeforms like humans and vargr are. Aslan are strong but not dextrous, have good hearing, and have a society that is still sharply divided along gender lines. Males have no concept of money or economics and may only take combative classes. Females, on the other hand, have exclusive province to classes like academic and merchant, but are not permitted to take combative classes.
- Luriani: A race of amphibious humanoids, also genetically engineered by the ancients.
- Sydites A race of genetically engineered humans bred to be workers, but none too sharp or charming.
- Ursa: Ursa are genetically uplifted bears. Unlike other genetically engineered races on this list, the Ursa were uplifted by a human corporation.
- Virushi: Virushi are huge but peaceful creatures with a centaur-like body form and thick plates covering their bodies.
2) "trade and commerce rules allowing characters to make money on the side of their adventures."
3) "The Universe/World Development chapter provides rules for generating star systems for use in a game. The system is not as the basic world generation system for classic Traveller that only generated the main world of each system; instead, the system is geared at generating entire star system like the classic Traveller supplement Scouts. However, the system is less computationally intensive than Scouts, simplifying many world details into single rolls that would require compuation in Scouts. "
4)"Traveller is historically a gearhead-oriented game, and D20 Traveller continues that tradition. The book provides complete rules for characters to design computers, vehicles (including robots and powered armor), and starships. The design sequences have a moderate level of complexity. The designers claim it is closely based on the classic Traveller supplement High Guard. The system looks easier to use than high guard to me, but provides a bit more detail than was available then. The system is easier to use than those in MegaTraveller and later editions, and much easier than the likes of the GURPS or CORPS vehicle design system. "
The Standard Design chapter provides a number of complete designs for computers, vehicles, and starships, including many vehicles and starship illustrations. Most of these are vehicles that have been regular edifices of the game such as air/rafts, scout ships, and free traders. As mentioned earlier, the book lacks any sort of deckplans, and also lacks illustrations of a few staple Traveller starships such as the scout and mercenary cruisers. "
"D20 Traveller uses the basic D20 combat system, but provides additions to handle conditions in an SF campaign. The combat system extends the rules to cover modern weapons and armor as well as vehicles and starships. Vehicles and starships use a different scale, and more advanced detailed systems are provided for more detailed treatment of such combat. "
edit: it got 5/5 on most reviews, seems like the winner (though I only know from dragonstar and star wars from first hand experience), unless you want to wait for d20 future
