Recently was released Wordpress 2.5.1. In this version was fixed 70-80 bugs from 2.5 but left some fun things.
According to numerous reports by individuals and a ticket filed in the WordPress Trac when a user resets their password, the password reset link received in the email does not work.
Bug-fix will be included in 2.5.2 version.
Follow Ryan McCue’s tutorilal if you want to reset your password with PhpmyAdmin, or download his patched files.
