The newest major SFF publishing line in the USA is Orbit Books, the re-launched SFF publishing imprint of Hachette's US arm. (A big chunk of Hachette US -- the former Warner Books -- is now called Grand Central Publishing, but Orbit is separate from that. Orbit is the sucessor, more or less, to the defunct Warner Aspect imprint, and, those of us with long memories may even remember that line's prececessor, Warner Questar). Orbit's first US list starts in September, and they've got a sizable program continuing on from there (including Iain M. Banks's new "Culture" novel, Matter, in February 2008).

To make it even more interesting, they've started a contest in which one lucky fan will receive one Orbit book a month free for an entire year -- the entry form and the complete rules are online.

Update, several hours later: Details of the intricasies of publishing have been tweaked; there are probably ten people in the whole world who will care. (Including me, though, since I'm compulsive about such things.) I also took the opportunity to fix a couple of typos.