...they now have a new free software out called Skype (http://www.skype.com/). It allows you to call and talk to your friends using P2P technology, for free. They have gone 660,000 downloads so far...
How is this different than MSN messenger with voice?
If I read it correctly, they say it's better than MSN Messenger. But, I like webcam chats more than voice chats, and there's nothing wrong with MSN Messenger's voice chat feature as long as you're both on a reasonably fast connection.