It's best to start with Bitten, then move on to Stolen, Dime Store Magic, Industrial Magic, Haunted, Broken, and then the upcoming (May 2007) No Humans Involved. While she writes so you can pick up the books in any order and have them make sense, some comments made snidely between characters only make sense if you've read them in the mentioned order. She has written probably the best werewolf fiction I have come across in a long time, though not every heroine is a werewolf (only 3 of the 7 books so far.)

Poison Study is the first in her new series, and the third book is set to come out in fall 2007. Good if you like fast-paced fantasy.