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2 people are curious.
iChat is the messaging client that comes with Mac OS X .
I’ve been jumping between Skype and iChat, and the advantage of Skype is that you can call land lines. iChat to iChat is much better than Skype to Skype. The calls are clearer, and if you use the Macs built in microphone and speaker it does echo cancellation.
The video phone is also quite impressive, it creates a pseudo 3D environment of the speakers in a conference call. To date I have not seen the picture quality equaled.