An update on Skype facts and statistics taken from the article by Rich Tehrani

Skype is the leading VOIP-category product worldwide,
* More than 24 million registered users
* SkypeOut more than 735,000 users around the world.

Downloads will always be larger than the number of registered users
* 130,000 downloads per day today, compared to 90,000 per day in October last year and 30,000 in March.

Current Updates:
* Marginal cost is zero for each call and the cost of adding new users to Skype is less than $0.01.
* We will keep Skype-to-Skype calling free and maintain the efficiencies of a technology business.
* Releasing Skype for Business this year, targeting groups not enterprises.
* Expanding our carrier relationships and regional partnerships, most notably in Asia.
* We've published an API and made it freely available for non-commercial use.