For developers

• JavaScript library: the jQuery JavaScript library has been included in Drupal 5. All existing JavaScript in Drupal core has been converted to use it.
• Reorganized directory structure: All modules now have their own directory and effort has been made to split up resources such as CSS by module. There is also a sites/all directory where you can place your custom modules and themes.
• Uninstalling modules: when uninstalled, modules will be notified so they can clean up database tables.
• Pluggable cache backends: with Drupal 5 you can plugin alternative cache backends. This allows you to use file caching, memcached or other cache strategies instead of the default database caching.
• Pluggable session handling: with Drupal 5 you can plugin alternative session handlers. This allows you to use memcached based session handling instead of the default database caching.
• PHPTemplate improvements: add the ability to look for a series of suggested templates. Drupal 5 will auto-discover a wide range of template files that allow you to override the default look of various pages.
• Node access arbiter: made it easier for node access modules to work well with each other.
• Node rendering: changed node rendering to work with structured arrays.
• Form API: made it possible to programmatically submit forms and improved the API for multistep forms.

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