A consortium of US universities got together last month and analysed Moodle 2.0.1 and, based on a number of factors, decided it was not yet ready for them.
The major show-stoppers for them included:
● Grade data is purged when a student is removed from the course
● Moodle 2.0 upgrades from 1.9 often fail or require manual intervention
● Moodle 1.9 backups can not be restored to Moodle 2.0 installations.
● Administrators can no longer perform mass uploads of files to courses.