Does placing AdSense on directory-style sites fall within TOS? Seems to me the nature of those types fall fairly close to scraper sites, due to the ease of generation of focused content, only varying in degrees of manual oversight.
Depends on whether the directory is a scraper directory or not I would imagine I mean I guess you have to ask yourself, would the people visiting the directory pages on web design be interested in finding a web design company on adsense? If yes, then I don't see why there would be any problem.