Just came across a really interesting feature on the www.RedHerring.com site
www.odiogo.com has a voice reader that reads out the article or you can do 'one click' to your ipod/mp3 player or you can just download straight to mp3 file.
Not sure what their revenue model is, I'm assuming free to content publishers and once volume is up they will be doing voice advertising insertions (will be interesting to see if they have to pay content providers a revenue split on the incoming ad revenue).
Not a bad solution, you can still tell it is computer generated voice but it’s comfortable enough to listen to if not a little stilted. Feel free to click on this link to the article I listed to. http://www.redherring.com/Home/24193