Night World series because I remembered that it was supposed to come out this April. But, much to my chagrin, I discovered that it looks like the release date was pushed back--to May 2011! Bummer!
I started reading the Night World books two years ago, when the first three novels were re-released into one big volume. You can read my review here. What I like about these books in a nutshell: they are all their own stories, but they're interconnected and related, and they are also very diverse. Whether you are a fan of vampires, werewolves, guardian angels, ghosts, witches, soul mates finding each other through reincarnation--whatever--the Night World series has got you covered. (Read my review of Volume 2 here, and Volume 3 here.)
I'm eager to see how L.J. Smith ends it all with Strange Fate, and it shall be hard to wait--but well worth it, I'm sure. If you're an impatient fan like me though, check out this neat trailer for the series!