Is the G-spot Part of the Clitoris?

Dear Dr. Betty,
I found an article in Discovery Health that referred to the g-spot as part of the clit. Since then I have found two more sources that support this claim; "I *heart* Female Orgasm" by Dorian Solot and Marshall Miller, and "She Comes First" by Ian Kerner. I'm so frustrated, because I'd like to believe these are reputable sources! Is this misinformation leftover from when the g-spot became popular, a case of overzealous clit-pride, or is there some truth to it?
R
Dear R,