Another brick in the Rails wall?

Liquid is a template engine optimized for xhtml and emails.
To start using liquid just extract it into vendor/plugins or better yet use the ./script/plugin script to install liquid. You can now start using templates with the .liquid file type...
Liquid features a very clean syntax and speedy execution speeds. The main difference to traditional ERb is that it does not rely on eval. This means that no potentially harmful code is executed when a Liquid template is compiled or rendered.The chief advantage is that you can let your users change templates without having to worry about your data’s security.