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A software problem at Skype left many users of the popular VoIP service unable to log in or make calls Thursday, and with little hope for relief until Friday, the company said. "Some of you may be having problems logging into Skype," the company wrote on its support blog at about 2 p.m. Greenwich Mean Time, or about 10 a.m. Eastern U.S. Daylight time, on Thursday. "Our engineering team has determined that it's a software issue. We expect this to be resolved within 12 to 24 hours. Meanwhile, you can simply leave your Skype client running and as soon as the issue is resolved, you will be logged in."
Having alternatives is always a good idea. I also use www.jajah.com and www.zoippe.com