Skype - You wont belive it.

Skype is almost too good to be true. This 2.0 tool allows you to communicate with anyone across the globe, via the internet - for free (as long as you are communicating pc to pc). A fee is charged if you want to skype to cell and/or home phones. But never-the-less, pc to pc communication is free. All you need to do is set up a free account and hook up a $5 microphone (on both ends). And, if you want to take it to the next level, just hook up a simple webcam, and you have free video conferencing. Just imagine what you could do with Skype in a language or science class (or any class for that fact).
Your students could interact with other students - anywhere.
A most useful tool.
http://www.skype.com/welcomeback/