dunno if anyone's heard of this, but i just read it in some mit tech magazine today..
it's made by the same people who created kazaa.. unlike cell phone plans that cost a significant amount of money (cuz cell phone operations are expensive to run), and where you get tagged with significant fees if you make international calls - skype is totally different.
with this thing, you can make unlimited calls to anyplace in the world for free!
apparently, all you need is some pieces of hardware in your computer. i'd assume that in a short while, you'll be able to use something like a palm pilot to make such calls with.
check it:
http://www.skype.com/skype.html
i'm totally getting this when i have to do my study abroad thing for grad school. that way i can still talk to all loved ones whenever i want.