We offer strong_paramters as a gem for Rails 3.2 apps, and generally tell anyone doing greenfield development to start with it to make the transition easier, and because it's simply better.
You can check the upgrading guide for more details about what's changed, and a third party is selling an ebook that has a ton of good info as well.
steveklabnik has it spot on. We're starting to move toward strong_parameters; we've got it as a gem, but we haven't yet made the change to entirely turn off attr_accessible.
We're also starting to use verb-matchers in the routes file, but that's going to be a bit more painful to deal with…
You can check the upgrading guide for more details about what's changed, and a third party is selling an ebook that has a ton of good info as well.