Status Updates From Test-Driven JavaScript Deve...

A good insight into unit testing, I understand now that merely adding tests to your code isn't enough with TDD, and that the primary idea of TDD is to get you to think about the problem you're trying to solve before you write the code. Very enlightening.

Chapter seven has some really good content in which the author explains the pros and cons of the various ways of achieving inheritance in JavaScript. Crockford's module pattern/functional inheritance is given a better description here than in Crockford's own book!