Since this is a question I'm frequently asked and since there are new visitors here all the time, I thought it might be a good idea to put this up again:
Order of the books.
The Cormac series:
1.Gridlinked 2. The Line of Polity 3. Brass Man 4. Polity Agent 5. Line War
The Spatterjay series:
1. The Skinner 2. The Voyage of the Sable Keech 3. Orbus
Prador Moon – the start of the Prador-human war and set before the above two series.
Shadow of the Scorpion – Cormac’s early years just after the Prador-human war.
Hilldiggers – a novel set after all the above
The Gabble – a collection of stories in the above future
The Engineer ReConditioned – a collection of short stories.
Runcible Tales – six short stories in a chapbook
Cowl – time-travel novel (completely separate from the above)
The Technician – book set after the rebellion on Masada (The Line of Polity)