Text to speech is technology is converting your text into voice. You can this tools many purpose like podcast, video narration, presentation etc its totally depends on your creativity

visit here - http://vozme.com/index.php?lang=en

2. http://www.zamzar.com

3. http://www.oddcast.com/home/demos/tts/tts_example.php?sitepal

4. http://tts-api.com

5. http://www.text2speech.org

6. http://sourceforge.net/projects/audiodocs/