I-Phone Speedo App?
 

Im gunna give it a go tommorow and see how acurate it is, if it turns out to be rather acurate im thinking i will end up getting a car charger/ holder for the i phone and mounting it up behind the headlight fairing.

This is the app i want to use:
http://www.youtube.com/watch?v=0TpVkB8_cJU

I was just wondering if anyones aware of others having tried this, i did use the search function allready but I-Phone Speedo brings up a load of threads that have nothing to do with this matter lol

Get a techmount:

http://www.techmounts.com/

I have a GPS\Speedo app on my pre that the roadside radar trailers say is accurate, and I've never had it jump out of my techmount.