Just finished Daemon and about to start Freedom. Great read, and it's amazing how quickly it ramps up near the end! I hadn't been hooked to a book like that since "The Moon is a Harsh Mistress" and "Dune"
It's not a sequel but has some common threads.
By the way: I'm not the only one for whom Sobel's bio screamed "John Carmack" from the first page he's mentioned, am I?