Here are some audio links to a few short stories and the opening chapters of several of the longer works.
Radio spot for the entire Chronopticus Chronicles trilogy.
A Moveable Peace (short story from Corridors)
Dust in the Whirlwind (short story)
In Remembrance of Simplicity (short story from Corridors)
Snowbound (short story from Horizons)
The Last Holdout (short story from Horizons)
Chapter One from An Echo Through the Trees
Chapter One from Gathering the Wind: What the Bible Says About God, the Weather, and Climate Change
Chapter One from Ionotatron
Chapter One from Theft at the Speed of Light