Just yesterday I discovered a book called "Typography: How to Make It Most Legible" by Rolf F. Rehe. After a search for Mr. Rehe's name on Typophile, I was surprised to find that he's never been mentioned here. Is this because there's an understanding amongst specialists in legibility that this guy is outdated (the book was published in 1972, updated in 1976), or have I happened upon some rarity in the Chicago Public Library?
My second guess is Mr. Rehe's research, a compilation of findings from psychologists and legibility experts, has been made redundant or irrelevant by more updated and thorough documents like the ones mentioned in Paul Hunt's discussion at: http://typophile.com/node/41577
Either way, I'll be paraphrasing his ideas in a Wiki, if I can figure out how to author one.