Well, recommending books depends largely on what it is that you would like to learn more about. If you'd be a bit more specific about where your interests lie we can probably give you additional suggestions.
That being said, here are some recommendations I would suggest.
Magic and Spell-casting :
"Before You Cast a Spell" by Carl McColman
"Spells and How They Work" by Janet and Stewart Farrar
"Modern Magick" by Donald Michael Kraig
" Wicca: a Year and a Day " by Timothy Roderick
" Wicca " by Thea Sabin
" The Witches' Goddes s" and " The Witches God " by Janet and Stewart Farrar
" The Wheel of the Year " by Ashleen O'Gaia (there are 2 books)
See the excellent list Weatherwax made athttp://www.spellsofmagic.com/read_post.html?post=858986
" The Druidry Handbook " by John Michael Greer
" The Druid Magic Handbook " by John Michael Greer
" Druid Mysteries" by Phillip Carr-Gomm
" Liber Null " by Peter Carroll
Ceremonial or Ritual Magic:
" Learning Ritual Magick " by John Michael Greer
Protection and Shielding:
" Psychic Self-Defens e" by Dion Fortune
" The Witch's Shield " by Christopher Penczak
I'm sure others will also chime in with suggestions regarding their own particular magical paths. And do be sure to let us know whether there is a specific area of magical practice about which you would like to know more.