May 9, 2005 WordPress 1.5.1 release。

Some of the highlights are:

* Login and feed fixes for IIS
* Faster gettext i18n
* Improved i18n string coverage
* Extended ping support
* Paging on the Manage –> Posts page
* URI-safe accent stripping for all UTF-8 characters in the Latin Extended-A Unicode block
* Query string style argument list support for wp_get_links() and wp_get_linksbyname()
* Improved hierarchy listing in wp_list_pages()
* Support for a Status: theme header field that allows themes to be marked as private, publish, or draft
* Improved caching and database query reduction
* Active plugin and theme highlighting
* Plugins can now have multiple option pages
* Pingbacks now work on hosts with fopen off like Dreamhost
* Many bug fixes

詳細參閱WordPress官網。