A short interview with David Allen recently appeared in the pages of Inc. Magazine.  While not a long article, it offers insight into the mind of the Getting Things Done author and his own personal challenges.  He also provides valuable advice for being productive.  From the article:

Why aren’t people able to be productive and manage their time well?

The first mistake is people keep stuff in their head. Your head is a crappy office! Building the external brain is a whole lot of what GTD is about. Your brain was not designed to remember and remind. That’s not its function and most people are still using it for that, and it doesn’t work.

Read the rest of the article at the Inc.com web site.