Rich Burridge posted an article bout using Talkr for automagical conversion of blog posts to podcasts. It’s very simple to setup, works pretty well (tho it has some problems with more technical terms). Quick signup on the Talkr site, installed the Wordpress plugin, did some minor editing of the plugin for full xhtml compliance and all seems to be working well.
And oh yea, the voice is rather, um, nice… 
The Automagical Podcasting by Matthew Schick, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
The talkr plugin link in this post is bad. Here’s a link to my plugin. Enjoy.
http://wordpress.org/extend/plugins/sds-talkr/