Well Google finally released a Video client.  They have had the chat client for a while, but now you can video chat also.  This is good like Skype for cross platform communication, because other services like MSN video chat require you to run Windows to video chat with users, so if you have a Mac, you can’t video chat with MSN users unless you run Bootcamp or the like.
You can download it over here – http://mail.google.com/videochat