When I get those this month, I plan to do a proper in order Stargate marathon:
Stargate (1994 film)
Stargate: SG-1 (Seasons 1-7)
Stargate: SG-1 (Seasons 8-10) and Stargate: Atlantis (Seasons 1-3)
Stargate: The Ark of Truth.
Stargate: Atlantis (Seasons 4-5)
Only one I won't have yet is Stargate Universe, but I'm not too interested in that one. I blame my love for Joe Flanigan and his portrayal of John for this. And also Daniel, Jack, Rodney and Carson. Plus Sam, Teal'c, Woosley and Hammond.