Here are all my posts on the fine-tuning argument:
Is there only one possible universe?
Bad Methodology in the Fine-Tuning Argument
Does the Fine-tuning Argument Commit the Fallacy of Affirming the Consequent?
Elliot Sober’s Objection to the Fine-tuning Argument
Fine Tuning As An Argument for Prior Probability
Here are some further resources on fine tuning:
Robin Collins’ homepage (Collins is a leading expert and defender of the argument).
Victor Stenger’s homepage (Stenger is a physicist and prominent critic of the Fine-Tuning Argument)
Ikeda and Jeffries, The Anthropic Principle Does Not Support Supernaturalism
Elliot Sober’s paper on Fine-Tuning
Luke Barnes’ posts on fine-tuning – Luke Barnes is a physicist who gives a knowledgable and even handed treatment of the fine-tuning argument and its critics.
Books:
God and Design: The Teleological Argument and Modern Science
The Blackwell Companion to Natural Theology
The End of Christianity – Which contains a chapter on the argument to design.