Games about probabilities
http://www.mrnussbaum.com/cards/index.html
http://www.mathgoodies.com/lessons/vol6/intro_probability.html
http://regentsprep.org/Regents/math/tree/PracTre.htm

Info
http://www2.whidbey.net/ohmsmath/CMP/hlii.htm
http://regentsprep.org/Regents/math/math-topic.cfm?TopicCode=tree
http://regentsprep.org/Regents/math/tree/Ltree.htm