Want math to be more than just working problems? Here are links to books, novels, poems, etc. that deal with math and mathematicians.
Math Fiction List is a database of stories based on mathematical concepts or starring mathematicians
NYC Teacher Tools Math Literature Page is a list of books, primarily picture books, sorted by subject matter (addition/subtraction, fractions, time, etc). Lots of links at the end of this list.
SMaRT Books at Kansas State University list sorted by grade level, although I'm not certain how accurate these grade levels really are. To my mind, Alexander, Who Used to Be Rich Last Sunday by Judith Viorst is a great book, but not appropriate for 8th graders, as this list suggests. Certainly not for gifted 8th graders! Take its recommendations with a grain of salt.
The Mathematical Art of M.C. Escher page at Platonic Realms Minitext is a fabulous discussion of the man, his art and what it has to do with math. Includes links for further reading. Great resource.