Privacy Protection Holes in Skype and other related services

Researchers at Polytechnic Institute of New York University (NYU-Poly) and in France and Germany will soon notify Internet scholars of flaws in Skype and other Internet-based phone systems that could potentially disclose the identities, locations and even digital files of the hundreds of millions of users of these systems

http://www.physorg.com/news/2011-10-uncover-privacy-flaws-reveal-users.html