http://www.statcan.ca/english/edu/power/ch9/first9.htm
Provides examples and defines various types of graphs and provides lesson plans. Examples of bad graphs are under “When is it not appropriate to use a graph?”
http://exploringdata.cqu.edu.au/read_me.htm
Teacher from Education Queensland provides data exploration downloadable files of sample data sets, graphs, assessments, and activities.
http://www.health.state.pa.us/hpa/stats/techassist/tools.htm
Pennsylvania Department of Health provides explanations of statistical tools used in analyzing health of populations.
http://www.mste.uiuc.edu/courses/ci330ms/youtsey/lineinfo.html
Devoted to providing example and defining various types of graphs.
http://www.mathleague.com/help/data/data.htm
Provides examples of line, bar, pie, and mean, median, and mode