If you wanted to learn $\mathbf{A}^1$homotopy theory, which sources in which order would you use?

A book that might be helpful, that is probably mentioned on website above is http://www.amazon.com/MotivicHomotopyTheoryNordfjordeidUniversitext/dp/3540458956/ref=sr_1_1?ie=UTF8&qid=1303257360&sr=81 Also, people now call it Motivic instead of $\mathbb{A}^1$ sometimes. 


Dan Dugger's paper on the subject is an extremely valuable reference, since he manages to set up the foundations in a natural manner. Some familiarity with model categories is certainly needed. A version is available on his web page: http://pages.uoregon.edu/ddugger/univ.html Of course the long MorelVoevodsky paper is the original reference. It has a lot of good information, although I did not find it easy going. 


Aravind Asok has an entire website devoted to pointing out resources for learning $\mathbf{A}^1$homotopy theory. It is organized quite well. The concept list section of the page has lots of wikipedialike entries on topics related to $\mathbf{A}^1$homotopy theory. 

