Skype has updated its Skype for Mac desktop client to version 126.96.36.19946, which now gives you the option to sign into Skype using either a Microsoft or a Facebook account without having to first set up a new Skype account. The new release also provides instant messaging capabilities to your contacts stored in Microsoft’s Windows Live Messenger, Hotmail, and Outlook.com services. The Mac client also adds support for open chats in multiple windows and for Retina displays. (Free, 34.5 MB, release notes)
Option-click to Hide Apps Quickly
This trick has been available in the Mac OS for years, but many people still don't know it. If you have too many windows cluttering up your screen, you can hide specific ones easily as you work. When you're in any application, hold down the Option key and click on another app's window, on the Dock, or in the Finder to switch to that other app and simultaneously hide all the windows in the previously current app.
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You can rename Skype 2.8 to "Skype 2.8" and install Skype 6, and then launch 2.8 most of the time, only launching 6 if you have a specific interoperability requirements.
As much as I think the newer versions are still pretty mediocre, I don't want to pretend that Skype 2.8 was a particularly good interface. It was just less bad, and it's clear that Skype won't be going back, regardless.