Skype Journal has a piece about the top ten advancements that happen to it in 2007.  Here is a snippet from the article:

While this blog tends to focus on new developments and the role they can play in our future real time conversations, it sometimes pays to look back to see what has been accomplished. For 2007, these are, from my perspective, ten top accomplishments for the Skype ecosystem:

Click Here to Read the Top Ten for Skype in 2007