I'll start with my two favorite educational theorists: Gardner, and Bandura.

Howard Gardner is the creator of the multiple intelligences theory and believes that the role of the teacher should be redefined as that of a collaborator rather than a mere dispenser of facts. 

Read more about Gardner:

• Gardnerss Harvard web site at  http://pzweb.harvard.edu/PIs/HG.htm

• Penn State University's site at http://www.ed.psu.edu/insys/ESD/Gardner/menu.html

• How Technology Enhances Howard Gardner's Eight Intelligences at America Tomorrow http://www.america-tomorrow.com/ati/nhl80402.htm

• The Psi Cafe: A Psychology Resource Site at http://www.psy.pdx.edu/PsiCafe/KeyTheorists/Gardner.htm

Albert Bandura’s theory is that students can build self-efficacy and new patterns of behavior through interactive and collaborative learning. The teacher should serve as a role model and cheerleader. Through this approach, students gain more than just knowledge – they gain a feeling of pride and success that will carry them on to future learning. 

Read more about Bandura:

• Self-Efficacy: A Community of Scholars at http://www.emory.edu/EDUCATION/mfp/effpage.html

• Shippensburg University of Pennsylvania at http://www.ship.edu/~cgboeree/bandura.html

• University of Texas at http://www.utexas.edu/coc/journalism/SOURCE/j363/bandura.html

Wolfgang Kohler supports a problem solving approach to learning. When students are allowed to get the “ah-ah” that comes with discovery, they gain insights to a subject that can’t be reached through traditional instructional methods. (Klinger, 1999)

Read more about Kohler:

• An untitled biography site at http://www.kirjasto.sci.fi/kohler.htm

• Kohler's Research on the Mentality of Apes
  http://www.pigeon.psy.tufts.edu/psych26/kohler.htm

• Dictionary of Philosophy of Mind at http://www.artsci.wustl.edu/~philos/MindDict/kohler.html

• Classics in the History of Psychology: Gestalt Psychology Today by Kohler at http://www.psych.yorku.ca/classics/Kohler/today.htm

Read about Lev Vygotsky at

• Vygotsky Resources at http://www.kolar.org/vygotsky/

Read about B.F. Skinner at

• The Educational Theory of B.F. Skinner at http://www.newfoundations.com/GALLERY/Skinner.html

Read about Robert Gagne at

• Encylopedia of Educational Technology at http://coe.sdsu.edu/eet/Articles/gagnesevents/

Read about Jean Piaget at

• The Educational Theory of Jean Piaget at http://www.newfoundations.com/GALLERY/Piaget.html

Here's a great overview site on educational theories and theorists from the University of Hawaii at Manoa: http://www.fs.hawaii.edu/edtheory.htm