The WSJ Journal article explains:
The researchers say the vulnerability could allow corporate rivals to track the movement of individuals from a company, as they travel between cities and states.
“You can scale this to track tens of thousands of employees,” said Keith Ross, a researcher from the Polytechnic Institute who worked on the 2011 paper, “and determine their strategy and who they’re trying to do business with.”
Le Blond also said the flaw could be used as a first step for hacking into the computer of an executive.
Forget executives - celebrities, government employees, politicians, and other high-profile individuals can be stalked or worse. This isn't Skype's brightest hour, but I suspect with all the recent news coverage, the Skype and Microsoft teams will fix this quickly. Unless of course, there is a core architectural reason why this isn't easily fixed, which I discussed yesterday.