Damn, I have the squeaky brake 'feature' too. After breaking hard a couple of times it generally seems to improve for a while, however it always comes back. This is my first M car, a friend of mine with an M3 said it's pretty normal and it's down to the compound of the brake pads.
I think I'll take a print of this thread when I take my car in for a service and see what they say. Although here in the UK I have a feeling they'll try to say that service bulletin is just a US thing
