David Allen is writing blog entries for The Huffington Post http://www.huffingtonpost.com/david-allen .
On the right side of this page there is a section called "This Blogger Books from amazon.com" and we can see that David Allen is the author of two books:
The Ready for Anything book is not mentioned at all. Funny!
- "Getting Things Done: The Art of Stress-Free Productivity" by David Allen
- "The Sibley Guide to Birds" by David Allen Sibley