Upgrading from WPMU to WP 3+


I've been away for a few months and am way behind on lots of things. One of the things I want to do is upgrade my WP MU 2.9.2 to WP 3+ so I can retain as much functionality as possible. Searching through the forum for threads about how to upgrade, I got all sorts of hits that gave me snapshots of one thing or another.

Can anyone provide me with a list of threads to read, and possibly a good sequence to read them in, that will guide me through the script and plugin upgrade process in a way that will avoid any damage to my dear old websites and blogs?

Thanks, hugs and kisses,