Comment on iChat

Excellent interface.

Audio chat works well with the built in microphone on my iBook and eMac. Manages echo much better than Skype and can be used without headphones. Audio quality is better than Skype, but doesn't support calls to telephones like SkypeOut

Video chat needs minimum 256k upload capacity from your ADSL/Cable ISP account to ensure reasonable video quality.

Can be very difficult to impossible to get working with some ADSL modems, be prepared to waste many hours debugging your modem setup.

Direct file transfer between users is fast.