In a response to an earlier thread I posted a notebook containing a basic tutorial on creating packages in Mathematica. Since the link to the notebook was embedded down in the responses to that post I thought it might be useful to some folks to have access to it at the top level here since they might have missed it.

I have updated that notebook a bit since the last time.  I hope it is useful to some people.  It was originally written as a tutorial for a consulting client of mine and he agreed to allow me to share with others.  

Enjoy. It is attached to this posting