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In the current issue of Justice League (#30) by Scott Snyder and James Tynion IV, in a story arc called "Justice Doom War", some members of the JL team travel back to the past and encounter members of the Justice Society of America (Atom, Dr. Fate, Flash, Green Lantern, Hawkman, Hourman, Starman, and Wildcat).
Took DC long enough!
By the way, is anybody reading Justice League with the JSA as part of the overall story arc?
(I'm still waiting for a tpb collection before I decide if I'll give in and buy it.)