Here are a variety of probability experiments, from throwing coins, throwing dice, choosing playing cards and spinning spinners.

Throwing coins
http://www.random.org/coins/

Throwing dice
http://www.random.org/dice/

Drawing playing cards
http://www.random.org/playing-cards/

Spinning spinners
http://www.standards.dfes.gov.uk/primary/teachingresources/mathematics/n...

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Here is another cool website for rolling 1, 2 or 3 dice:
http://www.teacherled.com/resources/dice/diceload.html