1) If you want a bookseller to find a book for you give them any or all of the following: The author, the title, the ISBN (a 10 or 13 digit number usually printed on the back or copyright page of the book). If you don't have one of those three things, it will be extremely hard to find your book (contrary to long standing myth, books can not be located solely by color.)
2) If a book is in a place you can get to it, it's for sale, even if it's the last one or located in a window display.
3) If you use books as a place to lean, set your purse, pad the charge slip you are signing, or set your beverage on a bookseller may burst into tears. Don't make the bookseller cry.
4) Booksellers thrive on conversations about books, and we learn a LOT from our customers. If you are browsing and you spot something you love, see if your bookseller has read it yet. Tell them why it is awesome.
5) There's an unwritten code among booksellers and librarians. We don't judge you by what you read. Just ask us for the books you want and let us help you read what you want to read. Believe me, we're a widely read bunch and you're not going to shock us with your reading choices.
6) If a store doesn't have the book or author you are looking for they most can likely order you a copy. When a shop doesn't have what you are looking for, give them a chance to compete with Amazon for your affection.
7) Booksellers do not get to read all day (we get this question a lot) and if we did it would indeed be really cool.