Roll the die & interpret the graph:
http://nces.ed.gov/nceskids/probability/

Probability:  Online - interactive:
http://nces.ed.gov/nceskids/probability/

Probability Lesson:  Good definitions with examples & short interactive quiz:
http://www.mathgoodies.com/lessons/vol6/independent_events.html

Regents:  Simple or Compound Events:
http://www.regentsprep.org/Regents/math/ALGEBRA/APR7/indexAPR7.htm

Experimental vs. Theoretical:  Do all parts
http://www.regentsprep.org/Regents/math/ALGEBRA/APR5/indexAPR5.htm

Marble simulation:  http://www.shodor.org/interactivate/activities/marbles/

Spinner simulation:  http://www.shodor.org/interactivate/activities/adjustablespinner/

SKUNK:  http://illuminations.nctm.org/LessonDetail.aspx?id=L248

Probability of getting a red fish?

http://www.bbc.co.uk/education/mathsfile/shockwave/games/fish.html

http://www.beaconlearningcenter.com/WebLessons/ChancesAre/default.htm#page11

Predicting Weather

  Sample Problems for 4th, 5th, 6th, Grade Probability Standards in Ohio:  Search probability.  Mouse over to see problems:

http://www.ixl.com/math/standards/ohio/fourth

http://www.ixl.com/math/standards/ohio/fifth

http://www.ixl.com/math/standards/ohio/sixth