I was wondering if iPhone has any API that supports Text to Speech feature? I looked around but couldn't find any, so just want to confirm. This will be great if iPhone have this feature..
Bhumeshwer katre's link to Speech recognition API is very helpful, but
OpenEars has the functionality you are requesting.
From the Introduction:
English text-to-speech on the iPhone, iPod and iPad
... and it is free to use in an iPhone, iPad or iPod app
It can be found here: http://www.politepix.com/openears/