As Skype surprised the open source community two months ago, recognizing that they were working in a linux open source version of their client, today I found that on 20th January they released a new version with a lot of bugfixes and new features like desktop sharing, support for UI styles (it includes integration with GTK+!!) and also several PulseAudio bugfixes (I bet I am not the only one who remembers that damn old bug that kept the CPU at 100%)...
Their plans are to release an open source UI to use with a closed source Skype library. I have no complains, open source community win!
It even makes sense to start thinking about skype integrated in empathy through telepathy-skype :)
There was already a project to do more or less the same with pidgin, but you had to have skype running, which is not so beautiful: skype4pidgin.