Mine is 00:BD:3A.

I am thinking about both sound annunciators, and notifiers like you get when an SMS comes in.

Thinking about this in a way that may possibly be doing violence to the Bluetooth spec, imagine that the N900 announces that is supports the "Maemo_Kin_Finder" services in addition to A2DP. Or is the list of services supported only disclosed after a pairing is successful?