Presumably there are a lot of people in the open source community interested in how a person managed to support his family when his main product is free.
Posted Oct 14, 2010 22:21 UTC (Thu) by nix (subscriber, #2304)
[Link]
His main product is printed books (in higher resolution than the webpages, and with extra strips in them which are not free). The online strips are a (very good) teaser.