http://www.hackaday.com/2007/04/04/wireless-guitar-hero-controller/

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[John] sent in his PS3 wireless guitar hero project. The concept seems popular today. Hopefully he’ll write up some instructions – but it looks pretty straight forward – he embedded a normal PS3 controller inside the body of the guitar hero controller. For now you can gaze upon the high res version. Update: He passed along a couple more shots of the project. Update2: Here’s the instructables on building your own.