I read The Forge of God over the course of a single weekend (yes, sad but true) and have to say that it's the most fantastic, epic and disturbing book I've read in many, many years.
The build-up is well-paced, the character's are all fully believable and the finale is as epic (and as depressing) as it gets. Bear's sequel, Anvil Of Stars, is just as impressive.
This is crying out to be made into a film with a good sci-fi director (Scott, Cameron, Hyams, Fincher) at the helm, along with Bear's classic 'Eon'. Although Bear prefers to keep on writing epic, near-future sci-fi such as his brilliant new Darwin's Radio, perhaps he could consider taking time-out to carefully develop The Forge of God into a screenplay. Putting images to this fabulous story would be the icing on the cake (that's if Bear's infamous 'Planet Eaters' don't gobble it up first)