You can talk to anyone on Skype over the Internet for free, and you’ll always be able to do that. There are some other useful things you can do on Skype that aren’t free (but they’re pretty cheap, actually).
SkypeOut is a cheap way to call from Skype to landlines and mobile phones. You can also use SkypeOut to forward calls to your Skype to your home number or mobile phone.
SkypeIn is a number your friends can call from any phone and you pick up the call in Skype. You can get numbers in one or more of the places offered, and receive calls in Skype from anywhere in the world.
Skype Voicemail takes your calls when you’re busy or offline.
So, I use a program on my computer with the nifty little headset Ben bought me last year to talk to you guys. Without paying for anything, I can call any of you on your computers if you have Skype. With SkypeOut, a pay a little to call you guys on your landlines, so you don't need to worry about being near your computer or anything. With SkypeIn, *I* don't need to worry about being near my computer, 'cause I'd have voicemail, *and* you guys could call that number (for regular rates for you guys) whenever you wanted. Any opinions noooow? :)