New categories
As planned, there are many new categories. We received a lot of feedback on this issue, and have tried to incorporate as many requested categories as possible, as long as there were enough blogs that would fit in the new category.
To help transition people to the new categories, we moved a number of blogs into the new categories. Although we tried to be careful when selecting blogs to move, it is a subjective process. If you are a writer, you can see -- and if needed, change -- your blog's category by going to the blog editing page and clicking "Change name and description".
As always, we're working on more requested changes, so please feel free to comment on features or categories you'd like to see!