Version 0.6.0 of the Multiple DB package is now available. This new version includes the following changes:
1) wp-db.php synced to WordPress MU 1.3 wp-db.php
2) New script to help move blogs to the new databases
3) Updated documentation and example files
This release was basically a compatibility release. There will be another release soon that will include a few new features.
Please let us know if there are any problems and we'll get them fixed ASAP.