Mollom provides a one stop solution for all spam problems and can protect the following Drupal forms. It offers and intelligently combines:

• CAPTCHAs -- both image and audio CAPTCHAs
• text analysis
• user reputations

and can:

• block comment form spam
• block contact form spam
• protect the user registration form against fake user accounts
• protect the password request form
• block spam on any node form, such as forum topics, articles, stories, pages, and more

For more information about Mollom, you can read this Mollom introduction.

Mollom is actively developed and maintained by Dries Buytaert, the founder and project lead of Drupal, and Benjamin Schrauwen. Mollom is currently in use by almost 20,000 sites include Sony, Adobe, LinuxJournal, Warner Bros Records, Netlog, NBC, etc.

Documentation on how to configure the Mollom module, including screenshots, can be found at http://drupal.org/handbook/modules/mollom.

The Mollom module is also included in the Acquia Drupal distribution.

#D7CX: I pledge that Mollom will have a full Drupal 7 release on the day that Drupal 7 is released.