I just heard that there is finally a sequel to Katharine Neville's "The Eight"! More information here: The Fire by Katherine Neville - Hardcover - Random House
I know a number of people here liked The Eight.
Also, has anyone else read anything from Carol Goodman? She's also into the sort of "historical/artifact fiction" thing, I think. I'd never heard of her till I got an advance copy of her latest, "The Night Villa" -- Amazon.com: The Night Villa: A Novel: Carol Goodman: Books -- and really liked it.