Just for your information, in case you haven't been flooded by the tweets and
blog posts, Passenger (a.k.a mod_rails) is available for nginx starting with
passenger 2.2.0.
Apparently it's targeted for nginx 0.6.36 (from bin/passenger-install-nginx-module).

Announcement :
http://blog.phusion.nl/2009/04/16/phusions-one-year-anniversary-gift-phusion-passenger-220/
User guide :
http://www.modrails.com/documentation/Users guide Nginx.html