Andrew Odlyzko has this habbit of writing interesting and provocative papers. A current paper focuses on the history, economics and social issues associated with discriminatory pricing.
The issues aren't black and white and Andy is very careful not to take a position. He does talk about how it can become incredibly sophisiticated. The comparison between the Internet and 19th century railroads and pricing schemes is fascinating. This is the first time I've seen a comparison of the two based on incentives for price discrimination (there have been many other comparisons).