I just found this lengthy Z4 review. It has a lot of info on the Z4 technology.
http://http://www.youtube.com/watch?...CY&feature=fvw
You do have to skip a few commercials but its worth a watch even if you're already familiar with the car.
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2020 X3M non-comp, Alpine White over black : Exec Pkg, ventilated M Sport seats, 20"s
2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims
Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i