I'm disappointed by the apparent lack of interop in iChat AV; since I won't use AIM or .Mac it looks useless to me. My impression is that Mac users have been clamoring not for yet another Mac-only videoconferencing app, but for something that can interop; in that respect iChat AV doesn't contribute anything. [Hack the Planet]
seems to contribute one heck of alot for those that can use it though. i tested it between here and nyc and chicago. i can see that this will make a difference, not tomorrow, but right now. I can do live f2f in 3 sec, instead of the 15 minute setups it used to take using gnome.