For the readers and writers on your list:
Book Related Athletic T-shirts (click and look at the pictures carefully to really get it)
Though personally, I'm rather fond of this one:
A thank-you note styled after the library cards we all knew and loved (which have mostly gone the way of library catalog cards...replaced by higher technology)-
The Book Lovers Calendar
All sorts of things from the Library of Congress bookstore, including the ever popular Librarian Action Figure. (Hmm. Note to friends and family. Don't get me this.)
And of course, all the best books, from your favorite bookstore.