I recently bought a new 15"PB, 1.5GHz, and have serious audio problems trying to talk with other Skype users using the integrated speakers and mic. The specific problem is a disturbing echo heard by the person I am talking too. Seems to be my mic is picking up his voice and returning it to him. Though I can solve it by using speakers, this problem doesn't occur neither with a 12"PB nor with 12"iBook G4. Has anyone experienced similar problems? Has the position of the microphone in the new PB's changed?