The web sites below will help you become a better textbook reader.

Handling Reader- Many informative topics such as, reading strategies, pre-reading decisions, reading and time, reading and remembering, etc...
http://www.ohiou.edu/aac/tip/reading/

Reading Your Textbooks Effectively and Efficiently - Article from Dartmouth College
http://www.dartmouth.edu/admin.acskills/success/reading.html

Remembering What You Read - Article from the College of St. Benedict-Saint John's University
http://www.csbsju.edu/academicadvising/help/remread.html