WordPress 2.2 is about to be released. Currently the release candidate 2 has the following features:

I looked at all the changes. It looks like it should be a non-brainer upgrade primarily targeted at fixing errors with PHP 5.2.2. It just might be the time for me and others to switch from 2.0.x codebase too. 2.2 appears to have ironed out most of the defects in 2.1 codebase.
BTW: All my plugins including Translator Plugin Pro works fine in the 2.1 / 2.2 codebase.