Background on medical checklists saving lives (and yet meeting up with resistance at times from medical practitioners) in this important New Yorker piece by surgeon/writer Atul Gawande:
Gawande now has a book out about checklists called "The Checklist Manifesto: How to Get Things Right" that expands on this and also describes the usefulness of checklists in other areas: http://www.amazon.com/Checklist-Manifesto-How-Things-Right/dp/0805091742 (If the topic interests you, btw, Amazon apparently is selling this $24.50 hardcover book for only $10).
http://commonphp.blogspot.com/ (from a Hacker News discussion about the first link above: http://news.ycombinator.com/item?id=782370)
Proper (and Improper) Usage of Memcached
Includes web-based services, Linux app, etc.
Includes everything from Google to Photoshop to PHP, Ruby, JQuery, etc.
Consultants are mystical people who ask a company for a number and then give it back to them.