Stabbing through all the views of your existing and mature rails app can seem quite daunting. But with the right approach it can be be quite productive. Want to throw in twitter-bootstrap? Need the an i18n treatment (translation & localization) of all the text elements and labels. Use this handy grep command to find the lines you need to tackle.
When you delve into setting up your rails application.manifest for caching your iPhone mobile HTML5 app in offline modus you will stumble upon rack-offline from wycats. A great tool. Here are some tipps for getting this up and running with rails 3.1 and the asset pipeline - quickly.
YAML and JSON and Rake to the rescue!