The 'Odiogo Listen Button' allows you to offer audio versions of your posts on-screen and to millions of iPod/MP3/mobile phone owners ... for free!
Odiogo enables you to convert your blog posts into high quality audio files. Check out the demo.
The procedure is extremely simple and should not take more than a few hours. You just need to fill out this form. An activation will be sent to you shortly after sign-up. Once your feed is enabled by Odiogo, you just need to promote the service on your home page and activate the Odiogo Listen Button plugin.
Sign up is free and happens here.
The Feed ID will be communicated upon sign-up.
Odiogo generates the following files:
You can view an example of this page.