For those of you brave enough to take the Moodle 2.0 plunge (or just want to flatten that learning curve in advance of a migration) here’s the “Beginning Moodle 2.0 Administration” docs from http://docs.moodle.org/en/Beginning_Moodle_2.0_Administration.
This is a great source of information on the errors and issues that have been met when trying to install or upgrade to Moodle 2.0. It’s a great place to start to try to get a handle at the pitfalls and tips to overcome them when taking the 2.0 plunge.
My favorite Q&A is below, relevant because I’ve been thinking a lot about 1.9 vs 2.0 lately:
Do I try to upgrade to Moodle 2.0 or just create a new install?
There is always debate around these issues, but simply put, Moodle 2.0 is not an update of an existing product. It is a complete re-write of a tried and tested tool. (Emphasis added)