Enough has been written about BMW's iDrive to fill a 1,000-page driver's manual. Then again, iDrive owners need a 1,000-page manual to figure out how to use it. Credit Audi for succeeding where the vaunted Bavarian firm failed. After a week driving Audi's new 2004 A8, we can report that the carmaker has created an electronic driver-car interface that is genuinely intuitive. The iDrive was just too clever. The menus within menus, the complex haptic-feedback mouse/knob device, and the labyrinth of subsystems all made easy tasks like changing a radio setting far too complex.