Apple iChat AV is a great Mac-to-Mac solution, but does not have a Windows client.
AOL AIM client can work with Apple iChat AV to provide a PC-to-Mac solution, but it is
so bad for a video call and is so firewall unfriendly that we do not recommend this solution.
As mentioned in the Windows video call section, SightSpeed is one of the best designed
solutions available and works for both Mac and Windows systems, so you can call people
using either operating system. As stated in the previous section, we recommend using both
solutions for the flexibility to make video calls with users of either solution and to users
with Windows PCs. More details on video call solutions for the Mac will be covered in
Chapters 6 and 7.
Security, Privacy, and Parental Controls ...