RTeX is an easy way to use LaTeX to generate PDFs from Rails applications. RTex lets you use control structures similar to ERb, and afterwards the appropriate calls to pdflatex are automatically made for you.
You can find out more about RTex in chapter 24 of Practical Rails Plugins; you can also find out more at the RTeX homepage.
Author: Bruce Williams
Installation:
ruby script/plugin install svn://rubyforge.org/var/svn/liquidrail/plugins/ziya/trunk