BMW iDrive Hidden Secret Menu howto:

http://bit.do/deH3T Secret sale page at TerraPrivacy.
The iDrive system in many BMW cars has a hidden back end that can be access through the navi wheel. there is a lot of information in here, most of which i dont actually understand but i'll be showing you how to access it anyway. This should work with all iDrive systems from around 2003 upwards.