As someone who was considering running a Stargate SG-1 campaign (yes, it's slightly different from Atlantis - but hopefully not too different) this is exactly what the doctor ordered. Thank you very much.
EDIT: Or maybe not - it doesn't have rules for the Goa'uld Energy Lance - which is reasonable since there probably aren't any Goa'uld in SG: Atlantis. Is there any other conversion material for the rest of SG-1 that anyone could direct me to?
(Unfortunately, I can't find a copy of the SG-1 RPG at my FLGS, otherwise I'd do the conversion work myself.)