Rack::Rewrite 0.2.1 has just been released. To install simply run: gem install rack-rewrite.
Rack::Rewrite is a web-server agnostic rack middleware for defining and applying rewrite rules. In many cases you can get away with Rack::Rewrite instead of writing Apache mod_rewrite rules.
Documentation is hosted at RubyForge. The source code is hosted at GitHub.
Updates include: