thank you for your answer. the 2003 and newer powerbooks must have the new implementation (2.0) of bluetooth enabling higher transfer rates and thus enabling the mere possibility of linking to a headset. as the bluetooth 1.0 doesn't support sufficient transfer rates for the speech signal. that's what i've been told
you don't even need a headset to test this, as the bluetooth setup assistant instantly denies the option when you chose to add a headset without even testing is one is present.
but anyway - thanks for you interest.