Check it out, a Samurai in found it's way into an iPhone app.

iOffroad





iOffroad is a Clinometer (a.k.a Inclinometer) for the true offroad enthusiast.  Get real world data so you know exactly how extreme that nasty hill or off-camber run really is.  iOffroad is a great tool for the seasoned extreme offroad veteran or the occasional weekend warrior.

Instructions:

• Rigidly mount device in the vertical position, while on level ground press the 0 button to calibrate the device, and enjoy a great day of wheeling while getting real feedback on the obstacles you are tackling.

Features:

• Works with new and older devices
• Uses the Gyroscope on new devices
• Uses the Accelerometer on older devices
• Listen to music while in use
• Graphical and numeric representation of pitch and roll
• Adjustable sensitivity
• Optional Disable Auto-Lock
• Adjustable audible alarm
• Easy calibration

http://itunes.apple.com/us/app/ioffroad/id400680797?mt=8