About a day after the official announcement I’ve found the time to make deUncategorize compatible with WordPress 2.1 codenamed Ella. Until now I was to lazy to try a version still in development or testing.
There’s only one version for WordPress 2.0.x and 2.1. The only difference on WordPress 2.1 is the lack of any checked category for new posts. Forgetting to set a category will result in an Uncategorized post after all. So deUncategorize still comes in handy to automatically deselect the default category when editing a post after submitting it and assigning the first custom category.