I pay $9.95/mo. and I can make as many calls as I want to landlines in other countries. One of my best friends lives in Tokyo and I can now call him as much as I want! It used to cost me a LOT more money to keep in touch (which then of course, resulted in not keeping in touch).
How? I use Skype Out. All I do is call a phone number they give me and then I dial the number (or press 1 for my speeddial contacts). Then I wait a few seconds and my buddy picks up and we talk for the next 2 hours, never worrying once about spending too much money! (And I get to call him using my cell phone too!!)
Check it out for yourself: http://www.skype.com/allfeatures/subscriptions/#uscaSubscriptionTab