I have it included with my ROM (I'm on ACS ICS v5.1), and I know it works on other custom ROM's too. Can't remember if it worked on stock GB (wasn't on it very long). If it's not working for you, you may want to try this: *GTalk W/Video-Audio*Working on EG22/EH17/EI22!! - xda-developers
Thanks so much for this post. I am total newbie so I will have to figure out what I am doing here. Flashed my moment whenver there was an upgrade when Sprint/Samsung decided not to upgrade them anymore. Upgraded to Epic back in June, so a little different ballgame. Love the information on this forum!