Derren Brown isn’t really memorizing the book – it’s a magic trick. There is a discussion about it here: Derren Brown - Library; possible?
Unfortunately, photoreading doesn’t work. There are some discussions about it here:
- Photographic memory and photoreading
- Photoreading Paul Shelle
- Photoreading Mental photography
- Questions about Photoreading
- Photo Reading Myth or Fake?!
There are also some discussions about what is actually possible with speed-reading here:
- Does Speed-reading Work?
- "The harsh truth about speed-reading" (and subvocalization)
- Speed Reading Is Real
And more on the speed reading page.