Meklort just finished testing both the 10.6.3 dvd and updating to 10.6.4. Everything looks good for users of NBI / NBBM.
To use the 10.6.3 DVD you *must* use NBI 0.8.4 RC1 or later. If you do, it will install without issues.
The 10.6.4 update also applies without any issues (again, tested with 0.8.4 RC1). NBI automatically runs [...]