We're running a pretty "old fashioned" deployment: Apache 2.2 on a dedicated load balancer and SSL terminator, proxying (using mod_proxy_balancer) to a handful

We're running a pretty "old fashioned" deployment: Apache 2.2 on a dedicated load balancer and SSL terminator, proxying (using mod_proxy_balancer) to a handful of servers running about four Mongrel instances per core. It's all backed by replicated PostgreSQL and Oracle instances for persistence. We do service monitoring and control via monit, deploy via Capistrano, and run a custom source-built Ruby distribution from a network share mounted on each of the app server boxes. I'm watching mod_rails/Passenger with interest, and once it seems to have stabilized a bit, will probably try it out for at least some of our apps.