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Stephane, those both look neat -- especially gaim-vv. I'd love to be able to video chat from Gaim as easily as you can from iChat.
But they don't seem be any more cross-platform than GnomeMeeting. There's no mention of compatibility with iChat/AV, or of having Mac and Windows versions of them.
They might be able to install Fink, and X11, Gtk+, and run GnomeMeeting or Gaim-vv on that, but that's not the way to keep Mac friends as friends. :-)