Tom's 1999 Fast Company article on WOW!Projects explains it best.
The fastest, smartest way to get your project defined and refined is to practice the art of quick prototyping. Don't keep your project hidden in some private skunk works until you can hone it into a perfect deliverable.
Before blogging became all the rage, Tom was posting book reviews and Observations (essentially early blog posts) to this site. You can find the archives below.
What we're talking about
on the front page.