In the meantime, here are a few resources that we have found to be useful.

Drupal - we like DrupalModules.com for researching contributed modules for Drupal. You can also go to Drupal.org, but it is tougher to search and find modules there.

See Drupal Tips and Tricks
See Zen Cart Tips and Tricks

If you are interested in learning more about some of the open source software solutions available, please feel free to look through our free demos of several PHP / MySQL based open source software.