MSN Chat Watch
This lets you to monitor both sides of chat conversations made on ICQ, AOL Instant Messenger, MSN Messenger, and Yahoo Messenger. One of the great strengths of Chat Watch is its ability to run completely hidden from the user. This allows you to monitor the user’s conversations without the user even knowing. Chat Watch is extremely simple to set up and you won’t even be able to tell it is running. But remember, it’s shareware.