WordPress 2.0 was released yesterday (from v1.5.x) — I upgraded my installation last night and had no issues. Great job guys.
Also, both of the plugins I maintain for WP work fine under 2.0 (I've updated the list of working plugins to reflect this). On a related note, I'll be releasing Smart Archives v1.1 sometime in the next few days and am working on two new plugins.
As you were.