I just posted over on another thread, but here it is again...
I just got some new info from my local distributor about updated Freescale docs:
AN1831 using MC68HC908 On-Chip FLASH Programming Routines
AN2874 Using M68HC908 ROM-Resident Routines
AN2874SW CodeWarrior 5 demo software for both the HC908QY4 and HC908LJ12
Looks promising...