Some other good series that i've read are the Gemma Doyle Trilogy by Libba Bray, the Wicked Lovely series by Melissa Marr, and Maximum Ride by James Patterson.
All of the Gemma Doyle Trilogy is out. The first one is A Great and Terrible Beauty, followed by Rebel Angels. The last book is The Sweet Far Thing. I love this series but I hate the way it ended. Also, this is going to be a movie coming out in 2010.
The Wicked Lovely series has the first three out. The first one is Wicked Lovely, and its sequel is Ink Exchange. The third one, Fragile Eternity just came out in April.
The Maximum Ride series is all out. This was a very entertaining series to read, especially during the third, fourth and fifth.