A to Z Teacher Stuff - Tips -- offers many ideas about things to do to motivate students -- the "motivating students" section has feedback from teachers about what really works in their classrooms.
Websites
Books and Articles
Bedient, D. & Scolari, J. 2003. Classroom Practice: Motivating Learners with the Unusual: Thinking from 'Inside' the Box. Phi Delta Kappan, March.
Rathvon, N. 1996. The Unmotivated Child. Fireside Publishers.
Scieszka, J. 2003. Guys and Reading (Motivating Male Students to Read). Teacher Librarian, February.
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Cheng, Y. & Yeh, H. 2009. From Concepts of Motivation to Its Application in Instructional Design: Reconsidering Motivation from an Instructional Design Perspective. British Journal of Educational Technology, 40(4): 597-605.
Gottfried, A., Marcoulides, G., Gottfried, A., & Oliver, P. 2009. A Latent Curve Model of Parental Motivational Practices and Developmental Decline in Math and Science Academic Intrinsic Motivation. Journal of Educational Psychology, 101(3): 729.
Needs, L. 2008. Motivating Learners in the Classroom: Ideas and Strategies. Support for Learning, 23(2): 97.