Okay, I got my 15" 1.5 GHz PB today, and I love it.... except the backlit keyboard doesn't work (see separate thread), and I am wondering about the line in jack. I bought iListen, without the headset because I already have a headset, that I have used with a PC using Office 2003 Speech Recognition. But I don't get any signal showing when I attempt even the Apple Speakable items with the line-in microphone. I understand that the line-in jack is set up for powered input. Does that mean that I need to run my mike through an amp and then to the PB? Thanks.