Skype 4 has been in development for a while and has had an official release. Why they developers of Skype can't produce a multi-platform client, releasing the same product across Windows, Mac and Linux, I don't know. Confusing. Anyway, the latest v4 brings a brand new interface (and we've still not decided whether it's better or worse than the previous version) which is geared towards video communication. If you don't intend to chat via webcam, go back to 'compact mode' which brings the interface more in line with the previous version of Skype.
Skype 4 link.
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Or they'll no longer be entitled to updates and bug patches