Skype is now offering international calls to Landlines and cell phones as well.

You can make a free 10 minute call to the countries listed below. After the first call, you can either add skype credit and continue taking, or use another skype account to make another call

From their website:

Your first call is free - up to 10 minutes to any phone, anywhere.
Make more calls with Skype Credit.

Skype-to-Skype calls are always free.

All first-time downloaders automatically get their first call free. The call can be to phones in more than 30 destinations around the world. But hurry, you only have 30 days to make that free call after downloading.

Where can you make a free call to?
You can make a free call, that could last up to ten minutes to any of the following countries: Argentina (Buenos Aires), Australia, Austria, Belgium, Canada, Canada (mobiles), Chile, China (Beijing, Guanzhou, Shanghai, Shenzhen), China (mobiles), Czech Republic, Czech Republic (Prague), Denmark, Estonia, France, Germany, Greece, Guam, Hong Kong, Hong Kong (mobiles), Hungary, Hungary (Budapest), Ireland, Israel, Israel (Jerusalem), Italy, Luxembourg, Malaysia, Malaysia (Kuala Lumpur), Mexico (Mexico City, Monterrey), Netherlands, New Zealand, Norway, Poland (Poland, Gdansk, Warsaw), Portugal, Puerto Rico, Russia (Moscow, St. Petersburg), Singapore, Singapore (mobiles), South Korea, Spain, Sweden, Switzerland, Taiwan (Taipei), United Kingdom, United States (including Alaska and Hawaii) and United States (mobiles).

Your first call with Skype is free