WordPress 1.5.1 Released

freshmeat.net: Project details for WordPress
There have been over 170 bugfixes and enhancements since version 1.5. These include security fixes, login fixes for IIS, improved i18n, better IDN support, extended ping support, improvements to the administration interface, improved caching, database query reductions, plugin API bugfixes, improved conditional GET support for all content/feeds, and support for pingback on systems with “allow_url_fopen=Off”. Plugins can now override certain core functions (allowing external authentication, for example).