Here are some exercises
Wrist curl barbell
http://www.physicallytrained.com/fm2...wrist-curl.PNG
Reverse wrist curll
Dumbell wrist curl
Seated reverse dumbell curl
[IMG]http://www.bodybuilder.dk/web/Images/Exercise%20Pictures%20Modifyed/Seated%20dumbbell%20reverse%20wrist%20curl%20Finis hB.jpg
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Standing reverse forarm curl
Preacher reverse forearm curl
Wrist curl exerciser
Bench reverese wrist curls
Standing wrist curl
Use hand grippers
Thors hammer
This can also be done to the front and reverse
I hope this can help you get started there is so many variations on the above exercises that I know of I could write my own book!