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1) How and where did PPC industry start?
2) PPC search engines (first ones, most popular,...)
3) Types of search engines; meta, with advertisers, etc
4) Paid mails / GPR/ Paid to read programs
5) Click fraud
6) Keyword related, contextual,...
Do you have some ideas or maybe useful URLs? Especially those that explain history, ups and downs, trends,...
That's the earliest I know of, would be interested to hear if anyone has earlier references.
Because of the importance of RealNames in getting Google into the paid search space, I think any discussion of the history of ppc has to include RealNames.