Amsterdam, where he is now based has great weather but productivity consultant David Allen has seen a lot of sunshine in California, where he lived for most of his life. Allen hit the big-time in 2001 with his best-seller Getting Things Done. The steps outlined in the book not only became a byword for improving personal productivity, Allen still continues to consult top corporate chieftains on making the most of their day. He recently wrote a revised editon and in the first of a three-part interview talks about why the basic principles of GTD are timeless.