Chris Anderson looks at deploying Rails apps with Capistrano and Mongrel on Planet Argon. He provides a whole pile of recipe snippets, as well as some Capistrano recipes for Mongrel 'spinner' and 'restart' tasks.

If all of this sounds like double dutch, you might want to skip this post, or learn more about Capistrano and Mongrel, as they're both very useful tools when it comes to Ruby on Rails.