SGD is basically a "what if" alternate version of SG-1 and Atlantis from Season 8/Season 1 onwards. What if they had developed armour that didn't suck? What if they disclosed the Stargate program? What if Earth had been viciously attacked? Basically, it's Stargate the way I think it should have gone. Sort of. It's a bit Earthwank, but not as much as the original concept called for (see below).
Stargate Domination originally started as a total Earthwank fic with deliberately bad (or at least lazy) writing. Primary inspirations included Rise of the Tau'ri, Birth of a Federation and the crossover Reaper's Origin. Over the development process, it evolved into something else. It still continues to evolve, with newer episodes deviating further and further from canon. Season two will basically throw the canon storyline out the window, abandon the episodic format and widen the scope. It will probably abbreviate to SGD as well, reflecting the change from the original intention.
There was originally a massive list of units and such here. It's horribly outdated now, and I've ditched it. If you want more in-depth descriptions, you can read the "enhanced" version over on Spacebattles.
