Update: Passenger 2.1.2 (final) has now been released.
The current stable release of Passenger (2.0.6) isn't compatible with Rails 2.3 because of recent changes in Rack. In the app I'm working on, this manifested itself as cookies not been set correctly, making it impossible to log out of the site. The good news is that the latest beta of Passenger includes support for Rails 2.3, you can install it (on OS X) as follows:
curl -O http://phusion-passenger.googlecode.com/files/passenger-2.1.1.gem
sudo gem install passenger-2.1.1
sudo passenger-install-apache2-moduleFollow the on-screen instructions on updating your config, restart Apache and you're done.
