Drupal Supporting Partner Program: This program is for Drupal-based companies (web development agencies, design firms, etc) and it is designed to give partners promotional, networking, talent recruitment and savings opportunities and more visibility as a community leader. All program fees help fund Drupal.org improvements.
Drupal Hosting Supporter Program: This program is for hosting companies who support Drupal. It provides a security test that can be promoted if passed and it offers opportunities to educate the community about hosting options. Program fees help fund Drupal.org improvements.
Drupal Technology Supporter Program: This program is for software companies (tools, ISVs) and it is designed to help them connect with the community in many ways so they can educate Drupalers on how to build even better Drupal sites with their offerings.