[Anastasopoulos 00] presents a nice list of variability techniques. [Jacobson 97] and [Svahnberg 00] also list these techniques.
[Clements 02a] is a comprehensive treatment of software product lines. It includes a number of case studies as well as a discussion of product line practice areas.
Organizational models are treated in [Bosch 00b].
The FAST process is from [Weiss 00]. The Philips example comes from [America 00]. Finally, the GM Powertrain example is taken from [Bass 00].