Luís, that was pointed out in the first post by DH. They aren't changing to Mongrel because it's the default way to serve rails.

The standard "opensource" (to exclude windows and IIS hosting) is apache (that may have the fast_cgi module). I believe in this case that one of the technologies (Rails) should adapt to the world of hosting (Everyone has apache as their main servers). I may not feel comfortable running my Django app in Mongrel and I want my PHP hosting running with mod_php.

As a costumer, I am with Dreamhost, not only because I'm their client, but also for other small hosts (that use Cpanel and Plesk) that I might be client in the future. Or else keep Rails applications for those who can/want to afford it.  