I\'ve used straight Mongrel, I\'ve used Mongrel clusters behind Apache, I\'ve looked at Thin, and I\'m becoming very intrigued by Passenger. I\'ve looked at Nginx, too. I\'ve lo
Have a look at Litespeed. You can get a free version that runs on 1 cpu or pay to get multi cpu. It is a bit expensive but is rock solid and handles rails brilliantly (i.e. uses less memory and is less of an overhead to monitor and setup). I run a massive amount of apps on it and it doesn't miss a beat.