Update 6: Things We’ve Learned at 37Signals. Themes: less is more; don't worry be happy. Update 5: Nuts & Bolts: HAproxy . Nice explanation (post, screencast) by Mark Imbriaco of why HAProxy (load balancing proxy server) is their favorite (fast, efficient, graceful configuration, queues requests when Mongrels are busy) for spreading dynamic content between Apache is the most popular web server i