Did they ever have any more contact with the Pegasus galaxy after they made it back to Earth? I know Stargate Universe definitely had some direct ties to events/characters from Stargate SG-1, but I can't remember if they ever even alluded to the adventures in Stargate Atlantis.
not on-screen, and I don't know if later comics or anything else told the story of where Atlantis went after spoiler but presumably yes - they still had several 304-class ships which could make the journey back to Pegasus, and those journeys had already become routine. It was never mentioned in SG Universe.