Sometimes is necessary load different configuration for each environment. This is a way to do it.

Add to config/environments/development.rb

Create config/environments/development_config.yml

Repeat the process with production environment.

The development file would be different for each developer, so is better to delete it from the repository:
cp config/environments/development_config.yml config/environments/development_config_sample.yml

Add to .gitignore
config/environments/development_config.yml

Yes, Macs also crash, but with artistic style.

If you want to tell Growl to show the current song on iTunes after hitting a combination of keys, you can use a Quicksilver trigger. Simply put this script in ~/Library/Application Support/Quicksilver/scripts, and create a custom trigger to open it.