Howtoforge posted a tutorial about installing OpenVZ with ISPConfig 3 on Debian 6

This tutorial describes the installation of an OpenVZ host server to manage virtual machines from within the ISPConfig 3 hosting control panel. OpenVZ is a lightweight virtualization technology for Linux servers, similar to jails on *BSD systems. ISPConfig 3 contains a module to manage OpenVZ virtual machines on the local server and on remote servers that run ISPConfig.

  Installing OpenVZ + Management Of VMs Through ISPConfig 3 (Debian 6.0)