The delayed_job README file is a good first source of information.

See also :

• delayed job command details
• Common problems
• Rake Task as a Delayed Job
• Ecosystem
• Delayed Job tasks for Capistrano 3

• Delayed Job Web
• Delayed::Web for Delayed::Job
• No Longer Maintained for Rails >= 4 - DJ Mon - Supports Mongoid and ActiveRecord. Also has an iPhone app.