While iChat is a standalone application, I seem to recall it is distributed with the OSX packages. I'd be a little surprised if AAPL decided to delay making iChat work with Facetime until a release of OSX 10.7 that seems still some months away. I'm sort of on the edge (!) of upgrading my iPhone 3G to iPhone 4, and this feature might push me over. Guessing there is a Grand Strategy(tm) about this in Cuppertino.
And will OSX 10.7 come in white?