Just to repeat what I've read:
Bluetooth does not seem to toggle OFF from the OS in 10.6.3 (in Mini 9 and others) because Apple did something with the Kext. I believe that Meklort is looking into this and will post a fix, if there is a way to repair the "Apple fix".
There may be a "hack" to turn off Bluetooth by putting the machine to sleep - when it wakes, BT
is Off. To turn back on, you have to re-boot.
That's my understanding at this date.
Otherwise, update from 10.6.0 to 10.6.3 using NBI 8.4 was amazingly simple
Great thanks to Meklort and others for their persistence and help.