In my travels around the U.S., I've found some great bookstores. The Hennessey & Ingalls Art and Architecture bookstore is one that I could spend all day in. In fact, they had to kick me out of the place when they closed. If you're graphically inclined and are going to be visiting Santa Monica, CA, then drop by... you won't be disappointed.
If you're like me and have a gazillion books on your bookshelf, then you might be interested how I deal with all my personal improvement and business books. As I read a book, I underline any passages that I might want to re-read in the future. Then after finishing a book, I rate the book on a scale from one to ten, note the date I finished the book and write a brief note that reflects what I thought of the book. I put all this information on the inside cover of the book.