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http://hmb-tec.de/iPhoneApps/Remote_Switch.html
Scroll to the bottom for the English part of the page.

http://www.hmb-tec.de/HMB-TEC/HMBTEC-STORE.html has more weird iPone/iPod apps

The idea is interesting, but all those dongles you have to stick on your iPhone are pretty unpractical imho.

They sell some pretty crazy stuff for the iPhone on this site... a stethoscope for your phone?