Matt Mullenweg announced that you can now post to your WordPress blog using any telephone in the world, go to your My Blogs tab, enable Post by Voice, and get a special number (U.S.) and code to call your blog. The new feature is powered by Twilio, a cloud-based platform for building communication and voice applications.
At present the service is offered free and allows recording lengths up to sixty minutes. Phone network charges may apply. Phone Your Blog may become a premium service in the future.
More info: http://en.blog.wordpress.com/2010/07/01/telephone/