Upgrading to WordPress 2.3 was painless. However, they did change a number of things. Categories and Tags. Kind of confusing, but here is a quote to better explain it:
So categories can be tags but tags cannot be categories. Categories are like the huge signs you see on aisles in supermarkets – “Food”, “Hygiene”, “Frozen” etc, they guide you to sections where you can find what you are looking for. Tags are like the labels on the products themselves.
So, in an effort to clean up my categories, I’ve been tagging. Though, it is, like moving over the old Slash content, going to take some time.