Web On Rails

The Exception Notifier plugin provides a mailer object and a default set of templates for sending email notifications when errors occur in a Rails application. The plugin is configurable and allows programmers to specify:

• the sender address of the email
• the recipient addresses
• the text used to prefix the subject line

The email includes information about the current request, session, and environment, and also gives a backtrace of the exception.

I am using this plugin and found it very useful, and suggest you to use it.

You can get this plugin from http://dev.rubyonrails.org/svn/rails/plugins/exception_notification/