I’ve written another WordPress plugin as a result of one of my client projects. After I imported old blog posts from Blogger into WordPress, all the Blogger tags had become WordPress categories. That was a huge number of categories, so I used the category-to-tag converter on the whole lot of them… only to realize that quite a few of them were then left with no categories. Since a lot of WordPress code assumes that every post has at least one category, the situation quickly became untenable.
Rather than edit each post by hand, I whipped up some code to assign the default category to all the screwed-up posts. If you’re in the same boat, you can now download it and fix your life with the press of a button. Enjoy.