Drafts Scheduler Plugin
Drafts Scheduler is a brand new WordPress plugin that provides some missing functionality in WordPress.
WordPress allows you to save posts as “drafts”, and it also lets you schedule posts for posting at a future date and time but doesn’t make it easy to do both in bulk.
Drafts Scheduler allows you to schedule all of your existing draft posts for posting either sequentially or randomly.
Download it from the repository here: http://wordpress.org/extend/plugins/drafts-scheduler/