Trojan that can listen in to phonecalls made using VoIP services such as Skype.

«Swiss government has been testing a "white hat" Trojan that can listen in to phonecalls made using VoIP services such as Skype.  Swiss newspaper SonntagsZeitung , reports that the Department of the Environment, Transport, Energy and Communications (UVEK) hired ERA IT Solutions some time ago to come up with a program capable of infecting PCs and tapping conversations without the need to crack VoIP PC-to-PC encryption. The program - which would have to find its way onto a target computer using some form of Trojan-like deception - would be able to record and save conversations, sending them to a remote server hidden inside normal network traffic.» Read more here at Techworld.

Related issues on security. 

My take : We don’t have to ban VoIP and limit certain business growth, or stop thinking positive about a possible 2nd dot.com boom. On the contrary, we just have to make if safer and manageable. I can’t wait to see Skype coming up with their Super Business Skype Management Control Device…  Accept that Anti-virus techniques add muscle to PC lock-down. It’s about making all the right connections.

Read also Swiss look to Trojan code for VoIP tapping