The command-line interface is our core focus with the Phoronix Test Suite, what we use in our internal benchmarking, and is what is used by most enterprise users that are not depending upon Phoromatic, but to help out those who want to use the GTK2 user-interface for their benchmarking we have created Ubuntu 10.04 LTS packages of the PHP5-GTK module with Cairo. We previously offered up Debian packages for older releases, but with the move to PHP 5.3 (from PHP 5.2) in Ubuntu Lucid, this broke ABI compatibility.
Found in this directory on the Phoronix Test Suite server are Debian packages that should work with Ubuntu 10.04 LTS / Debian Squeeze and Ubuntu 10.10 should also work using PHP 5.3.x. We previously made a 32-bit package, but uploaded today is a new 64-bit package with the latest Subversion code for the PHP GTK and Cairo support.
Once PHP GTK support is installed, it's just a matter of running phoronix-test-suite gui to use the GTK2 user-interface. There are also some pending user-interface improvements for Phoronix Test Suite 2.8 "Torsken", so for now it's recommended to use the UI with the stable 2.6 release branch.