Best text to speech app for iPhone eBooks?

Any recommendations for a text to speech app for iPhone eBooks? I’d like to be able to listen to a book on my iPhone when I’m out for a walk rather than read it!

UPDATE 2/27/12

While not an iPhone app, I downloaded GhostReader yesterday and made several audio books from PDFs. Pretty cool!
http://www.convenienceware.com/ghostreader.php

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