I have the noise as well, but it is pretty minor compared to my clicking comfort seat and wind vibration noise (both corrected by the dealership by replacing the seat base, sunroof assembly, and adjusting the roof rack).

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PhoenixM3
2008 M3 Sedan - Interlagos Blue [On Order]
2008 X3 3.0is - Black Sapphire, Sport Activity, Premium, etc.
2007 X5 4.8i - Deep Green, Sport, Premium, Technology, Comfort, etc.
2005 X3 2.5 - White, Bare bones, Auto (My business delivery vehicle)
2001 M3 Convertible - Phoenix Yellow, 6-Speed