Might come in handy if you need to make some worldwide calls in the near future.
From site: We'd like to give you unlimited calling free for an entire month. That means, in addition to making free Skype to Skype calls, you can also call offline contacts on their mobiles and landlines.
Details: Trial must be redeemed by 15/11/2012. Offer available only to existing Skype users who have been registered with Skype more than 29 days. To qualify for the offer, you must provide valid payment details. After the first month, your subscription will automatically continue and payments will be taken monthly unless you cancel within 27 days of the start date. Only one free Unlimited World subscription can be claimed per customer. Offer not available in China, Korea, Russia or Taiwan.
Just make sure to unsubscribe after the month trial if you don't want to pay for it.