Books I find most useful

I've wanted to update the list of RT books, that I like, in my sidebar. Instead of maintaining a list of all of my RT books, I'm now just going to maintain a list of the 9 that I find most useful. Getting the list down to nine was pretty hard.

I'm keeping the list in a carousel widget, which has now replaced my old list. The carousel widget only allows you to have 9 books in it.