Drupal 4.6.0, 2005-04-15
------------------------
- PHP5 compliance
- search:
    * added UTF-8 support to make it work with all languages.
    * improved search indexing algorithm.
    * improved search output.
    * impose a throttle on indexing of large sites.
    * added search block.
- syndication:
    * made the ping module ping pingomatic.com which, in turn, will ping all the major ping services.
    * made Drupal generate RSS 2.0 feeds.
    * made RSS feeds extensible.
    * added categories to RSS feeds.
    * added enclosures to RSS feeds.
- flood control mechanism:
    * added a mechanism to throttle certain operations.
- usability:
    * refactored the block configuration pages.
    * refactored the statistics pages.
    * refactored the watchdog pages.
    * refactored the throttle module configuration.
    * refactored the access rules page.
    * refactored the content administration page.
    * introduced forum configuration pages.
    * added a 'add child page' link to book pages.
- contact module:
    * added a simple contact module that allows users to contact each other using e-mail.
- multi-site configuration:
    * made it possible to run multiple sites from a single code base.
- added an image API: enables better image handling.
- block system:
    * extended the block visibility settings.
- theme system:
    * added new theme functions.
- database backend:
    * the PEAR database backend is no longer supported.
- performance:
    * improved performance of the forum topics block.
    * improved performance of the tracker module.
    * improved performance of the node pages.
- documentation:
    * improved and extended PHPDoc/Doxygen comments.

Drupal 4.5.8, 2006-03-13
------------------------
- fixed bugs, including 3 security vulnerabilities.

Drupal 4.5.7, 2005-12-12
------------------------
- fixed bugs: no critical bugs were identified.

Drupal 4.5.6, 2005-11-30
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- fixed bugs, including 3 security vulnerabilities.

Drupal 4.5.5, 2005-08-15
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- fixed bugs, including a critical "arbitrary PHP code execution" bug.

Drupal 4.5.4, 2005-06-29
------------------------
- fixed bugs, including two critical "arbitrary PHP code execution" bugs.

Drupal 4.5.3, 2005-06-01
------------------------
- fixed bugs, including a critical input validation bug.

Drupal 4.5.2, 2005-01-15
------------------------
- fixed bugs: a cross-site scripting (XSS) vulnerability has been fixed.

Drupal 4.5.1, 2004-12-01
------------------------
- fixed bugs: no critical bugs were identified.