The sa9200 and the hdd1630/1830 ports are probably stable enough to be have their status upgraded to "unstable."
The only minor thing missing from the hdd16x0 ports was radio detection for the 1620 models without the fm radio. I never found a way to dynamically check for the tea5767 chip so that two different builds weren't required for those players.
The current sa9200 installation is not really user friendly because there's no UMS USB mode in the OF. I had a modified bootloader that uses sendfirm for the initial install (similar to the Gigabeat S, I think). I'll have to try to get that working again and do some testing.
For now, the hdd6330 should stay listed as "unusable" because it still needs major work on the touchpad before all the buttons are fully functioning.