The Examples for Developers Project aims to provide high-quality, well-documented API examples for a broad range of Drupal core functionality. You can download the code from the project page, view it on api.drupal.org, or experience it (for several of them) at drupalexamples.info.

Recently, we've added two new example suites:

• Drupal 7 Queue Example, (see the code on api.drupal.org or experience the UI on d7.drupalexamples.info). This Drupal 7 code should also be compatible with the D6 Drupal Queue module, which is a backport. Thanks, coltrane!
• Drupal 6 and Drupal 7 Menu Example. These examples use nearly every feature of the Menu API, and provide easy-to-access examples of tabs, placeholders, and many of the other fairly obscure features of the Menu API. See the code on api.drupal.org or experience the examples at drupalexamples.info.

Examples for Developers is a community project. Contributions are encouraged (just use the issue queue). If you find a problem, please submit an issue. If you want to fix a problem you find, please submit a patch. It will never be perfect, but if we tend it as a community resource, it should get better all the time.