FriendlyId is the "Swiss Army bulldozer" of slugging and permalink plugins for Ruby on Rails. It allows you to create pretty URLs and work with human-friendly strings as if they were numeric ids for Active Record models.
Rails 3.0✗
Thread Safety?
JRuby✓
Ruby 1.9✓
Rails 3.1?
A newer version (4.0.5) is available for this plugin
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There is an issue on github (http://github.com/norman/friendly_id/issues#issue/41) where Norman Clarke says that he is working ot it.