Inferential Thinking Across the Curriculum
http://eduscapes.com/sessions/pilot/pilotinference.htm
Great set of resources for students to practice thinking skills about inferencing. Materials for use in science and social studies are highlighted.

Visible Thinking
http://www.pz.harvard.edu/vt/VisibleThinking_html_files/VisibleThinking1.html
Take advantage of the materials deeloped byone of the project Zero teams at Harvard. Explore the "Thinking Routines" ink at every level for some great tips for teaching thinking to students.

Bloom' Revised Taxonomy
http://www.kurwongbss.eq.edu.au/thinking/Bloom/bloomspres.ppt
Discover a PPT on the revision as well as colorful posterm which can be easily printed for use around the classroom.

Think About Thinking
http://www.girlsgotech.org/think_about_thinking.html
Have students play the mxed messages game and then discuss the various functions of the left and right sides of the brain.