I serve my blog with the following WebStack:

• Debian GNU/Linux (what else)

  See my sysctl.conf file

• Nginx

  See my NGinx configuration

• PHP-FPM / APC

  See my PHP configration

• Varnish

  See my Varnish configuration

• Wordpress with the "WP Super Cache" and "Varnish HTTP Purge" plugins

Feel free to share and fork !