iPhone4: How to get it to read your iBooks out loud
It's the annoying iPhone vs EVO voice , meh, I rather read myself.* Spoken books. The free iBooks app, which is Apple’s answer to the Amazon Kindle, can actually read your books and PDF documents out loud to you.
To make this work, turn on VoiceOver, the text-to-speech feature that makes the iPhone usable by blind people. That is, open Settings -> General -> Accessibility and turn on VoiceOver. (There you can read about some of the other changes in your lifestyle that are required when VoiceOver is turned on; for example, you double-tap things instead of single-tapping them, because single-tapping makes the phone speak the name of whatever you’re tapping.)
Then open a book. Tap the first line (to get the highlighting off the buttons at top).
Now swipe down the page with two fingers to make the iPhone start reading the book to you, out loud, with a synthesized voice. It even turns the pages automatically and keeps going until you tap with two fingers to stop it.
Yes, this is exactly the feature that made its debut in the Amazon Kindle and was then removed when publishers screamed bloody murder. But somehow, so far, Apple has gotten away with it, maybe because nobody’s even realized this feature is in there.
Here's the original source with some other tricks which I thought weren't really tricks but pretty much known to many.