Jonathan Barket just sent me a patch that gets resource_controller's scaffold_resource generator to spit out RSpec specs! I quickly merged it in to master, and wanted to announce it to the world, since it's something I've been hoping to get added to the plugin for a while.
r_c's scaffold_resource generator now supports vanilla test/unit, Shoulda, and RSpec for tests, and erb, and haml for templating. It will sense which of those plugins or gems you have installed in your app, and generate accordingly — it's absolutely 0 configuration.
So, if you're an RSpec user, grab the latest master from github, and get generating! :)