You can always use mod_rails in development mode on Apache:
<VirtualHost *:80>
ServerName myapp
DocumentRoot /rails/myapp/public
RailsEnv development
<Directory "/rails/myapp/public">
Options FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
Minus the ability to run an inline debugger, it works the same as
mongrel or webrick, except multi-threaded and faster.
