With Earth-2's announcement the other day (and yes, I'm really excited about it) the possibility of a crossover between it and Justice League of America started to occur which, in turn, made me remember this page from Brad Meltzer's run on JLA:
The Earth-2 that's shown there features characters from both the classic Justice Society and what appears to be the satellite-era League (am I the only one who prefers that blue and white costume on Zatanna?)
Will we see anything like it over the next year or two? Difficult to call when, but it would be just like Geoff Johns and James Robinson to do a crossover between the two titles when JLA gets to issue #21 in eighteen months or so . . .