Which Web Server?
As I started to research this topic, there are several Slicehost tutorials on setting up various configurations. But there is a Slicehost blog entry that references the deprec stuff mentioned earlier.
Mongrel is apparently the darling of the Rails community. According to its homepage:
But I keep reading about how to configure other web servers (Apache, Lighttpd, Nginx) as reverse proxies for Mongrel.
Mongrel is a fast HTTP library and server for Ruby that is intended for hosting Ruby web applications of any kind using plain HTTP rather than FastCGI or SCGI.
Installing Rails on a fresh Ubuntu Gutsy (non-Slicehost specific) install is described here.