Having now seen the excellent documentary on the autistic savant, Daniel Tammet, and noting the subject's popularity, I've done a little Googling to get some more information for you...

This is the BBC News report of Daniel Tammet's attempt at the British and European record for reciting pi. He is able to remember 22,511 decimal places of pi without using any special memory techniques.

'The Savant Syndrome' provides more background information on autistic savants. The article is by Dr. Darold Treffert who is widely published on this subject and was a consultant to the movie Rain Man. More on other autistic savants at Wikipedia.

New York Times review of the documentary.
Science Channel 'Brainman' site [contains extra video not in programme]

Making Habits, Breaking Habits

In his new book, Jeremy Dean--psychologist and author of PsyBlog--looks at how habits work, why they are so hard to change, and how to break bad old cycles and develop new healthy, creative, happy habits.

→ "Making Habits, Breaking Habits", is available now on Amazon.

Reviews
The Bookseller, “Editor’s Pick,” 10/12/12 “Sensible and very readable…By far the most useful of this month’s New You offerings.”

Kirkus Reviews, 1/1/13 “Making changes does take longer than we may expect—no 30-day, 30-pounds-lighter quick fix—but by following the guidelines laid out by Dean, readers have a decent chance at establishing fulfilling, new patterns.”

Publishers Weekly, 12/10/12 “An accessible and informative guide for readers to take control of their lives.”

→ You can dip into the first chapter, or check it out on Amazon.com.