Shelly Brisbin has been hard at work and updated iOS Access for All. It's a book about accessibility on iOS - walking you through using all of the Apple features designed to assist people. Additionally there are reviews of hundreds of accessible iOS apps.
Even if you don't have a disability yourself it is worth reading this book - many of the features talked about helpful for the rest of us too!
You can check the book out over at iOSAccessBook.com.