It took me a while, but I finally did it. I ripped the voice files from Justice League: Heroes. The files are in wav format. Haven't tried them out (yet) in-game, but I'm pretty sure they'll work.
Here's the link:http://www.mediafire.com/?7as59sa88od1p5f
Sooooo... which voices do we have here?
Aquaman, Batman, Superman, Wonder Woman, Green Lantern (John Stewart), Green Lantern (Hal Jordan/Kyle Rayner), Green Arrow, Zatanna, Flash, Martian Manhunter, Zatanna, Huntress, Hawkgirl. There's enough material to make pretty decent voicepacks for XML2 or MUA (I don't have MUA - but figured these files would be most useful here).
Hope you guys do enjoy. And I hope someone gives XML2 some love!