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The Tango app has already been doing this.
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)

The Tango app has already been doing this.

Tango only works phone to phone. I believe Yahoo is the first app to allow video calls between iPhones and computers.
 
Heard that worked between phones and Window desktops, but not Mac desktops.
 
I've tried it on my iPod Touch 4g but it keeps crashing. I get a beep and then it hangs on the connecting... state :(
 
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