After few betas, Inline Manual Drupal module has reached stable 1.0 version. Throw screenshots, screencasts and word documents away! Be interactive and agile. :)
"Inline Manual is a service to create interactive, reusable and easy to maintain step-by-step documentation for end-users of a website or application. Be it a tutorial "How to add a new user" within a CMS you've just built or a tutorial showing how to manage specific content."

The Drupal module allows you to: