In netstudio we like to run experiments. We do that very often because we know that it positively affects the site conversion rate.
We try to find ways to make everything do often easier to implement. Thus, in sites made by Drupal, we use the Google Website Optimizer module. This module automatically inserts the necessary script to the pages that are to be tested and also to the conversion page, saving us some time from having to add the necessary scripts to the site theme manually. The module was developed for Drupal 6 by Nick Schoonens from Australia and was ported to Drupal 7 with the help of Geoff Brown from Canada.