"In the plex" and "I'm feeling lucky" - both are very good and offer very different angles. As you can guess by the name first is more formal history whereas second are memoirs of a their marketing guy who has got a very good sense of humour :)
It will gracefully kill 2 most memory-consuming unicorn workers above random range of 144-192MB of memory. It proved to be extremely efficient and simple solution to our needs.
http://37signals.com/svn/posts/2991-behind-the-scenes-ab-tes...