I managed to put an iPad in my E53. Works absolutely great, with some great surprises (like the fact that when using Pandora, the song names appear in the instrument cluster, and you can fast-forward using the s/w control -- don't see why that works, but it does!). I was just messing around when I put it in, but the ultra-simple system I devised works much better than I could have hoped. See the thread

http://www.xoutpost.com/bmw-sav-foru...tml#post856236