As of rspec-rails-2.0.0.beta.17, generators and rake tasks are exposed through a Railtie. In order to see them when you run rails generate and rake -T, you need to include the rspec-rails gem in the :development group in your Gemfile.

group :development, :test do
gem "rspec-rails", ">= 2.0.0.beta.17"
end

If you have a previous version of rspec-rails-2.0.0.beta installed, you should also remove these files:

lib/tasks/rspec.rake
config/initializers/rspec_generator.rb