Does Rails 3 eliminate URL helpers for 'show'???

I don't seem to have the usual *_url, *_path helpers for the show,
update, or destroy actions on resourced routes. If I make a new rails
app and add a route resources :random, I get url helpers for new,
edit, index, etc - but not for the helpers that require passing a
model instance.

Has this been changed in Rails 3, or do I just have something
misconfigured?

The documentation for ActionController::UrlFor says the helper routes
are *supposed* to be made, and I can still generate the routes using
ActionController::PolymorphicRoutes#polymorphic_url - I'm thinking
this is a bug???