Here are some books featuring witches that you might want to check out. I will add the amazon link for each. If you know of some good ones that aren't listed here, feel free to add them in the comments section.
A Discovery of Witches - It doesn't have a summary on Amazon. Simply says it became popular in 2011. http://www.amazon.com/Discovery-Witches-Novel-Trilogy-ebook/dp/B004DI7HZ6/ref=sr_1_9?s=digital-text&ie=UTF8&qid=1380914041&sr=1-9&keywords=witches
Dark Witch - This is a Nora Roberts book.
Easy Bake Coven- With a title like that, how can you resist?
A Modern Witch- This book has a lot of good reviews behind it
Crushed- This is the first in the Witch-Game series.
Witch Hunt- A game of hide n seek played by witches.
Lonely Souls - the first in a series.
The Secret Circle- part one of L.J. Smith's witch series.