I really am concerned at this news.
It took long enough to get Skype to produce an effective Linux Client.
I can just see the "evil empire" keeping the existing Linux client and then as the product develops easing the linux version out because "it is no longer compatible.".
I can also see the "evil empire" also trying to turn itself into the "world's" phone network. Free Computer to Computer Calls will go!
With Google dominating search, Facebook social media and Microsoft voice communications, the world Interweb really is becoming dominated by a small cartel of US controlled IT companies.
We really do need companies like Amazon.com, baidu.com, yahoo japan etc. to start fighting back internationally and offer competitive products.