I have BM-Link 1.50.1, Beoport version 1.21, and itunes 7.4.2 under OS 10.5.1.
The color keys work but the >> and << keys don't. The up and down keys do. The number pad does sometimes. As in, it doesn't seem to do anything in N.Music but it will change the channel in N.Radio.
And THAT'S how you report a problem to tech support!