I haven't seen anyone mention it.
I can confirm that on my Nexus One, running Androic v2.2 FRF50 pre-release, full hands-free dialing is supported and works really well.
I've got round to trying it out last week and I'm very happy with it.
Just waiting for the final drop of Android v2.2 now.....though it may be a close thing with CyanogenMod v6 which is about to be released as a test version for Nexus One and the "32B phones (G1 and Magic 32b)....based on the Android v2.2 source code released last week.
These guys don't wait around......