Yeah, I'm a big fan of this series. Newman is a serious horror/pop culture fan, so the books are filled with allusions and cameos, but they're also well done novels in their own right. There's four main books as well as three short story collections about the Diogenes Club, the secret agency that the main character of the first couple books works for, as well, but those aren't part of the main saga.
It's smarter than it lets on. He basically culls from a large portion of the history of vampire and horror fiction and blends them together in a fun, interesting way. Almost League of Extraordinary style. Even characters like Hellboy and Blacula eventually show up. He also plays with some interesting concepts about how a full vampire-society would run. It's a really fun read.
Yeah it's a good, fun book in the steampunk/alternative history vein. I haven't read the rest of the series, but this one is worth reading.
Hmm, well, I will def check it out now. Will report back impressions after I finish Alas, Babylon.