Had a member create a blog or made a category somehow, and I can't figure out how to delete it. I banned the member, but the category he created us still on my site. I wouldn't normally care, but right on my main page is "RICH BITCH" under the categories block, "Blogs". There is no blog, and no RICH BITCH category in my blog category admin list.
Stumped...

It certainly was when I was testing the betas. I am not sure if you can edit user categories from the admin panel but you can certainly edit the system categories. I would have to look but you can do that and work it out. Go to Administration -> settings -> Category Settings. You can change things there and test it out.