Make rake task from gem available everywhere?

For Rails3 applications, you might want to look into making a Railtie for your gem.

You can do so with:

lib/your_gem/railtie.rb

require 'your_gem'
require 'rails'
module YourGem
  class Railtie < Rails::Railtie
    rake_tasks do
      require 'path/to/rake.task'
    end
  end
end

lib/your_gem.rb

module YourGem
  require "lib/your_gem/railtie" if defined?(Rails)
end

Though, I had my share of difficulties with requiring the rake.task file in my railtie.rb. I opted to just define my measley one or two tasks within the rake_tasks block.