[_pdeschen]

Agree. I had to optimize my wordpress installation recently including some caching. Since there is not that much information about nginx, I took some notes and wrote about it. Here is my blog post:

http://blog.rassemblr.com/2011/01/wordpress-need-for-speed-o...

[Sukotto]

There's also this post from patio11 that, amongst other things, describes what he does to use nginx + wordpress.

http://www.kalzumeus.com/2009/08/22/using-wordpress-and-rail...

[jalada]

Nice resource, I'll update my post with a link to that.