Annotate Models

http://agilewebdevelopment.com/plugins/annotate_models

$ script/plugin install http://repo.pragprog.com/svn/Public/plugins/annotate_models

Manage Fixtures

http://agilewebdevelopment.com/plugins/manage_fixtures

$ script/plugin install http://svn.toolbocks.com/plugins/manage_fixtures/

Localization Simplified

http://agilewebdevelopment.com/plugins/localization_simplified

$ script/plugin install svn://rubyforge.org/var/svn/l10n-simplified

Acts as Taggable on Steroids

http://agilewebdevelopment.com/plugins/acts_as_taggable_on_steroids

$ script/plugin install http://svn.viney.net.nz/things/rails/plugins/acts_as_taggable_on_steroids