Robie from Pirateweather writes about a new service called Feed2Podcast that will turn your RSS feed (or any RSS feed) into a audio player so you can listen to the feed "They/we use new text to speech engine and your rss feed and turn your blog into a podcast instantly" It's a pretty good text to speech engine - here's what it sounds like with their preview audio player, click here to listen. Neat!
http://blog.makezine.com/archive/2005/12/turn_a_rss_feed_into_a_au.html