As of today I'm offering custom firmware upgrades for MINI/BMW/Rover/LandRover SatNav units. Not unfortunately for the newer 2006 onwards ones, as they're not as hackable, but for the earlier (Mk4) drives, it's do-able. I've been playing with the firmware for months now, and as a result, the hackable firmware gives you :
Birdseye view on your Nav (Most units are factory programmed with 2D)
Postcode searching
And the most important feature - a custom bootup logo.
The custom bootup logo can be anything you wish, the manufacturers logo, a photo of your car, girlfriend, boyfriend, dog, cat, whetever. Price for a custom disc is 20 Euro. If I sell one a year, I'll be amazed