iBooks has a scrolling view. If you turn on VoiceOver, it will read the text and scroll as it does so. You can either turn down the volume or listen as you read. The reading rate can be adjusted in Accessibility settings. I have configured the Home button so that triple click toggles VO on and off. The Kindle app doesn't have scrolling but again has excellent VO support and will flip the pages for you.
I don't know if the information is current and complete, but wikipedia lists several other iOS reading apps with auto-scroll:
http://en.wikipedia.org/wiki/Compari...eader_software