Well, in doing an interview about Stargate: The Alliance for my site, there as a nice, juicy tidbit about a Pegasus game!
Ill do my best to discover more. Of course, if you want to read the full interview, go here : http://superiorversion.com/?p=431
There were no ties to Atlantis with the SGTA game, but we were in pre-pre production, if there is such a production stage, of an RPG that would have taken place in the Pegasus galaxy. It was very early days, but I thought the initial concept was very exciting. i was only involved with that indirectly at that stage, though.