At the 2009 Barcamp Leeds I attended a talk by Neil Crosby where he talked about automated testing, and about how he felt there was a gap in everything that people were testing. Everyone has unit tests, and people are doing full stack testing too, but no-one (so he feels) does XHTML/CSS/JS validation as part of their automated test suite. ...

When I create a rails app from scratch I like to include certain plugins to help me write the app, such as the Rspec testing framework instead of the built-in Test::Unit and jQuery instead of prototype.