Skype Trojan Can Log VoIP Conversations
Slatterz writes "Security giant Symantec claims to have found the public release of source code for a Trojan that targets Skype users. Trojan.Peskyspy is spyware which records a voice call and stores it as an MP3 file for later transmission. An infected machine will use the software that handles audio processing within a computer and save the call data as an MP3. The file is then sent over the internet to a predefined server where the attacker can listen to the recorded conversations."
If you could track the numbers called (on skypeout), you might be able to identify calls to banks, credit card companies, etc., and listen only to those.
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