The BMW Z4 is a rear-wheel drive sports car by the German car maker BMW. It follows a line of past BMW roadsters such as the BMW Z1, BMW 507, BMW Z8, and the BMW Z3.
http://en.wikipedia.org/wiki/BMW_Z4

z4 Technologies, Inc. z4's technological focus is the development of DRM solutions and DRM connectivity platforms to assist Software/Digital Content Providers in protecting their ...
http://z4.com/

An overview of the BMW Z4 roadster and coupe that includes buying advice, model history, and specifications, covering all model years of this BMW sports car.
http://www.edmunds.com/bmw/z4/review.html

Whether Coupé or Roadster, roof down or closed, the BMW Z4 models combine outstanding performance with striking design.
http://www.bmw.com/com/en/newvehicles/z4/overview.html

An Expression of Joy: the BMW Z4 Roadster. ... Everything you need to know from equipment options to accessories, all explained in detail.
http://www.bmw.com/com/en/newvehicles/z4/z4/2009/introductio ...