Great list, thanks! One of my favourite quotes: "Constraints are like structured programming for variables". https://web.archive.org/web/20070422104545/http:

Great list, thanks! One of my favourite quotes: "Constraints are like structured programming for variables". https://web.archive.org/web/20070422104545/http://www.donhopkins.com/drupal/node/69 https://web.archive.org/web/20070422104545/http://www.donhop...