Skype has updated its Skype for Mac desktop client to version 184.108.40.20646, 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)
Using Expose within Spaces
To drag a file into an application that's running in another one of your Spaces, use Expose while in Spaces overview mode. First, press F8 to go into Spaces overview mode, then press F9 to Expose all application windows. Hover over the application window you want and wait a moment or press the Space bar, and both that space and that application come to the foreground, ready for you to drop the file.
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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.