Skype has updated its Skype for Mac desktop client to version 18.104.22.16846, 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)
Compare More Easily in Apple Mail
In Apple Mail, if you need to work back and forth between two different views of Mail's mailbox contents, you can do so quite easily. For example, you might want to look at a mailbox holding all filtered-in sales orders from the past week while also looking at a smart mailbox showing unanswered customer questions.
To avoid constantly clicking between mailbox views and losing your context each time, choose File > New Viewer window to get a second window and then arrange each window as desired.
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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.