Well, what pads are they? I have the absolute best luck of eliminating squealing by staying with the OEM pads. Worst squealing I have ever had was using EBC pads on two different bikes. My original set of OEM pads never made any noise, and I have put the newer compound 2010 pads on my '09 (to possibly help reduce compound build up), and they are as quiet as the first set.
Over on the HD forum the answer to squeaking pads is to file the leading edge of the pad a little, seems to work for them.