The first one is called Roland Harvey's Drawing book (Young Designer Series), published by Scholastic. Of all the many art books I've read through and looked at, this one has been the most helpful to me so far. Because I'm the type of person who needs to read and see something to learn it, this book is perfect. Roland Harvey's illustrations are very funny, cute, and clever, as well as informative and helpful. For a beginning illustrator and/or artist, this book is great. He even shows how he works on illustrations for books! If you're a new artist, or are just looking for some helpful tips or ideas, you should definately check it out.
The second book is The Pocket Muse by Monica Wood, published by Writer's Digest Books. This book is simply full of ideas. Literally. Monica lists all kinds of ways to get ideas for stories. There are even pictures that are meant to give you ideas. Very helpful if you're having writer's block. :)