Today he wrote a long piece on "The Long Tail", a very influencial article that became a book.
We've discussed the idea of the "Long Tail" before on the donationcoder.com forum, and if you are already familiar with the concept, you might not learn much new. But if you aren't familiar with the concept, this blog is as good a place to start as any.
The Long Tail is the transition from a hit-focused marketplace to a millions of niches marketplace. While the majority of profits previously were made by selling a handful of products (the hits) to a lot of people, now millions of products are being sold to smaller amounts of people based on niches.