Reference checklist for starting a new Rails application?

It's easy to create a new Rails application using "rails new myapp" (or start with a template from Rails Wizard or the RailsApps project).

But after that, what do you do? What gems do you always add? What decisions do you make before beginning development? What important items are often overlooked before deploying an app?

I'd like to put together a reference checklist to share. Any suggestions?

For example:

• Create a new RVM gemset
• Modify the .gitignore file
• Switch from TestUnit to RSpec
• Set up Guard to run tests in the background during development
• Add the viewport metatag to the default application layout
• Don't forget to create a sitemap.xml file
• Add a Google Analytics snippet

What else?