Just upgraded to WordPress 2.0. In total (removing 1.5 files, copying over the 2.0 files and the running the upgrade script) it took maybe 7 minutes. The theme and plugins all seem to work as expected. All data and configuration is just like before. That’s how simple an upgrade should be. Kudos to the WordPress team!
Now I gonna see how the new spam filter support is working. Reports seem to be optimistic.