From the press release:
Acapela is proud to announce that following the success of its TTS for iPhone, additional support for iPad is also now available, allowing developers to create vocal applications for iPad, iPhone and iPod Touch.
Acapela TTS for iPhone SDK, already well known, extensively deployed and used in a broad range of talking apps available on the Apple appstore, is widening its support to the developer community. Acapela is bringing its super natural voices to the iPad environment, adding value to rich content and inspiring new ways to transform content and tell stories.
You might want to scroll down and click through to the announcement. Acapela included a screen reader flash app on the page. It's not very good, but it's still fun to listen to.