Just tried Macbook with the new skype video for mac. I keep getting a horrid buzzing sound in the audio whenever I speak. If I mute it on my end, I can hear the other person clearly. I think it could be a feedback problem with internal microphone and the speakers but I've tried all combinations of volumes with both. In system preferences > audio > internal mic I try to pull the adjustment to lower levels but it just keeps readjusting itself up. My powerbook never had this problem on skype.
FYI, the int mic works fine with other programs and there's no buzzing.
Ideas?

it will be a feedback issue , which you half worked out yourself..

Grab a headset or even better a bluetooth headset and forget your worries...

It works fine with earphones but my point was skype worked fine with my old powerbook and now its got this problem with the macbook. I shouldn't NEED to use headphones...thanks for your reply though.