A gem that provides exception notifications to hoptoad as rack middleware.
Throw something like this in your config.ru to enable notifications.
require 'rack_hoptoad'
use Rack::HoptoadNotifier, 'fd48c7d26f724503a0280f808f44b339fc65fab8'
If your RACK_ENV variable is set to production or staging it'll actually post to hoptoad. It won't process in the other environments.
% sudo gem install rack_hoptoad