The official US Artemis Fowl website has posted clips from each of the books. You can read these excerpts below.

Artemis Fowl - The prologue, and two chapters are available.

The Arctic Incident - Prologue and first chapter.

The Eternity Code - Prologue and first chapter.

The Opal Deception - There is no chapter available, but there is a short extract, as well as a sound clip available on the US website.

The Lost Colony - The whole first chapter is available, as well as a sound clip available on the official site.

The Artemis Fowl Files - A short extract is available, thanks to Puffin.