Any update on this? I, too, am a bit dismayed that standard 2.5mm stereo headsets that work with any other phone do not seem to work with the centro. It's bad enough that Palm does not use a mini usb connnector for hot syncing, but now we have to buy their headphones too?

Update - some further searching indicates that this is a Palm "feature." The headphones need to present a certain impedance to the Centro otherwsie the phone will only send mono to avoid blowing out a microphone on a single ear piece headset. Solutions are: trial end error, buy a Palm headset, or a Seido adapter device that corrects the impedance.