It would be very useful to be able to encrypt and password protect the IM Logs. Multiple people use the computer where Adium runs, and sometimes IM conversations need to be kept confidential. I envision this working by making the user enter a password, potentially different from the IM account password in the log viewer. There could be a dropdown menu that could toggle between different accounts, each account requiring a password. I use different accounts for different purposes, so information needs to be kept distinct. There would be an option with the global adium preferences to enable/disable encrypted (and password protection) for each account. This option can be made when setting up adium with a new account as well.