I loaded the latest 'alpha' Desire ROM for Nexus One from Paul O'Brien at modaco.com.
Bluetooth is broken - known issue - but they have a modified kernel that enables the use of the FM radio support on the Nexus One.
I'm currently listening to NatRad on 101.4FM on my Nexus One.
That's nice.....but I need the bluetooth so will be restoring my usual system in a few minutes. But the whole package can't be far away now. :-)
Heh....incoming mail notification just killed the radio sound. Not very stable. But as a proof of concept, it's awesome. :-)