I was reading Zivtech's site today. They often have good Drupal articles, and someone there has recently sent a batch of very helpful errata on my Learning Drupal 6 book. They had a link on their site (courtesy of the Drupal Planet feed, no doubt) to an article entitled How I Survived a 2300% Traffic Increase With Drupal.
I clicked on the article and read the whole thing before realizing that the author of the article is none other than John Forsythe, who was a technical reviewer on my book -- and a HUGE help in finding errors and suggesting improvements.