Revelation Space is the gateway drug that got me hooked on
Reynolds' strange vision of the future. It forms a loosely connected
trilogy with Redemption Ark (featuring a riveting
near-light-speed chase between the stars spanning decades) and
Absolution Gap (with a virus-induced religious cult, moving
cathedrals and a vanishing gas giant).
Aurora Rising and Elysium Fire form the Prefect
Dreyfuss Emergency sub-series. They're police procedurals set in
the Glitter Band, a swarm of thousands of orbital habitats.