This document outlined some of the problems we ran into while building the Follow the Oil Money contribution network mapping application. It was written in November 2007, partially as a proposal, so many things changed in the real version. Also, most of the links are dead, as they pointed to an internal server. More info here.
An Interactive Web Application for viewing Oil Industry Contribution Network Data
Report to Oil Change International by Skye Bender-deMoll and Greg Michalec