Howtoforge posted a tutorial about using PHP5-FPM with Apache 2 on Ubuntu 11.10

This tutorial shows how you can install an Apache2 webserver on an Ubuntu 11.10 server with PHP5 (through PHP-FPM) and MySQL support. PHP-FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busier sites.

  Using PHP5-FPM With Apache2 On Ubuntu 11.10