Kobi Alexander fled the United States ten days ago. He was tracked down in Sri Lanka via a Skype call:
According to the report, Alexander was located after making a one-minute call via the online telephone Skype service. The call, made from the Sri Lankan capital Colombo, alerted intelligence agencies to his presence in the country.
Ars Technica explains:
The fugitive former CEO may have been convinced that using Skype made him safe from tracking, but he — and everyone else that believes VoIP is inherently more secure than a landline — was wrong. Tracking anonymous peer-to-peer VoIP traffic over the Internet is possible (PDF). In fact, it can be done even if the parties have taken some steps to disguise the traffic.
Let this be a warning to all of you who thought Skype was anonymous. [Schneier on Security]