iSpeech is becoming more perfect(currently in beta).
ispeech is an online text-to-speech service which gives readers an opportunity to listen to websites or blogs, rather than read it.By embedding one snippet of code on a blog, for instance, will allow visitors to carry a player to take your blog on the go as an iPod podcast or MP3 download.
It also lets you convert any documents like WORD, PDF, Excel,HTML, etc. to speech. The process is very simple, Just upload any supported document you wish to convert to speech and click “Convert”. Once the conversion is complete you can listen to it online, download it or podcast it.