View this example in your browser and you'll see "hocus pocus."
Effigy is distributed as a gem through gemcutter:
sudo gem install effigy -s http://gemcutter.org
Effigy requires Nokogiri.
Effigy is based on the idea that putting behavior in your templates is confusing and makes them difficult to maintain, and that the closer an ERB template gets to 50% Ruby, 50% HTML, the closer it gets to total chaos. Complicated views require unintuitive concepts (ERB buffers, capture blocks, etc). ERB also has the constant threat of unescaped user input slipping into a view.