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(From the README:)

Usage:

 script/plugin install git://github.com/brynary/rack-bug.git

 # config/environments/development.rb
 config.middleware.use "Rack::Bug"

 # add bookmarklet to browser
 open http://RAILS_APP/__rack_bug__/bookmarklet.html

# If using the gem instead of a plugin (gem install rack-bug)
# config/environments/development.rb
config.gem 'rack-bug', :lib => 'rack/bug'

Notes:

To use rack-bug with hoptoad, you need to stub hoptoad from trying to serialize the environment variables that rack-bug uses like so:

 HoptoadNotifier.configure do |config|
   config.environment_filters << 'rack-bug.*'
 end

Thanks to:

  Django debug toolbar
  Rails footnotes
  Rack's ShowException middleware
  Oink
  Rack::Cache

A nice introductory screencast by brynary:
Rack::Bug debugging toolbar in four minutes

If you’re having trouble with Rack::Bug enabling on a remote server or in production, or with getting SQL queries to work, you should read Security.