This may be old news to many but thought I'd post a heads up for the Voip program offered from www.skype.com . I started using it a few days ago and the voice quality is excellent for a free program. It's very similar to MSN however your can make voice calls. I've used it both nationally and internationally and it appears to work better the greater the distance between users.
May help reduce some STD call rates for some.
I have no connection to Skype apart from being a user.