Stuart Herbert has posted about a very helpful method server admins can use out there to not only help secure their server but possibly make their web hosting users more happy in the long run - using suphp on a shared server (security).

The challenge with securing a shared hosting server is how to secure the website from attack both from the outside and from the inside. [...] This has created a gap that a number of third-party solutions have attempted to fill. One of the oldest of these is suphp, created by Sebastian Marsching.

He works through the whole process - the installation (this is all on a Gentoo linux system), configuring for your Apache install, changing Apache to make it work with suphp and finally some benchmarks and parting comments concerning its use.