Thanks for giving detailed step by step instructions. I didn't install ISPConfig, but I found the rest of the howto very helpful - informative, detailed and up-to-date.

I actually ran this on a hardy heron installation. apt-get couldn't find php5-ps. When I checked at http://packages.ubuntu.org I found this is available upto gutsy and then also planned for intrepid but not in hardy repos... would this break anything ? (Haven't been facing any thing unexplainable so far)