I only suggest this for the Nov 2002 TiBook and Jan 2003 12" PowerBook owners. Don't do it on the 17". Even if it does work (which it should), the benefits are not as significant. The Jan 2003 17" already supports DVD-RW, and there is no backgrade to DWDB. There is a backgrade to D0CB though, which is the firmware on TiBooks and the Jan 2003 12".
Don't do it on the new AluBooks either, because they use slightly different drives, and already have all the features that D101 provides. (UJ-816)