Here's a concept that I had never heard of: autocasting.

From what I gather, you can use a piece of software (AutoCast is an example) to automatically generate mp3 files from a synthesized vocalization of your RSS feeds. These files can then be included in a podcast feed. Interesting. I know there are plenty of folks in the library blogosphere who'd like a program that did the opposite, providing an automated transcript of my shows. I wonder if there is really a market for machine readings of human-generated blog posts.