Wicca is a pagan religion (neo-pagan). Which other neo-pagan religions are you interested in? There are many. Probably the two most important things you can do are avoid books published by Llewellyn and avoid anything that claims that Wicca is of Celtic origin (it's not). It's true that there are a few worthwhile books published by Llewellyn (someone listed them above), but avoid the rest. As far as Wicca goes, Antigone's suggestions would be good. As far as other pagan religions go, you'll have to tell us which ones interest you so we can make suggestions.

One exception to the "no Llewellyn books" rule I would make is Scott Cunningham's "Wicca: A Guide for the Solitary Practitioner". Unless you already are aware of a Wicca group in your area, chances are you will be starting your exploration of Wicca all by yourself.

http://wicca.timerift.net/
http://www.witchvox.com/

http://www.witchoftheeast.com/

Until you have done some initial study, stay away from books with a crescent moon on the spine (Llewellyn).

Try:

The Heart of Wicca - Wise Words From a Crone on the Path - Ellen Cannon Reed
The Elements of Ritual - Deborah Lipp (a rare exception to the Llewellyn rule)
The Way of Four - Deborah Lipp (another exception)
A Witch's Book of Answers - Eileen Holland, Cerelia

AVOID Silver Ravenwolf and Fiona Horne (unless you want to learn a bunch of inaccuracies).

http://en.wikipedia.org/wiki/Wicca
http://en.wikipedia.org/wiki/Paganism

There are also good links at the bottom of each of these pages. Have fun.