To celebrate both Summer and the World Cup, Skype is offering some amazing promotional deals. In the US, Skype users can enjoy unlimited free calls to landlines and mobile phones. Additionally, many international calls (to countries with World Cup soccer teams of course) are free — from 60 minutes per month to unlimited access, depending which country you'd like to call. The deals vary from country to country, so make sure you check out all the details over at Skype's promo page.
There is one catch — to sign up for the free calling, you'll have to sign up for a Skype account. So take note — after the free period ends, normal rates will apply!