<s>i'm running into the same problem! i'm guessing it has something to do with running 10.2.8 and the most recent ichat that will run on this, and it will be solved by my new ibook, but just a little annoyed that it's not working properly because i forget i'm talking to people!
any advvice? i've looked everywhere i've thought of but all the settings seem right. i hear sound when i send outgoing messages, but nothing when they reply.</s>
edit: nevermind, i double checked my prefs and one little checkbox was throwin it all off!