Too much of a good thing can be wonderful.

Mae West

Top three sites with quotations by women.

1. Voices of Women: Quotations by Notable Women
• About.com Women's History Guide Jone Johnson Lewis has an article and an extensive collection of quotes by women, organized alphabetically to woman's name.
2. Creative Quotations by Creative Women
• Organized by day-of-the-year, often coordinated with a famous woman's birthdate, are quotes organized by the website author's scheme: five characteristics of creative people (foraging, reflecting, adopting, nurturing, knuckling down).
3. Words of Women
• A searchable database of women's quotations. If you have some idea of what you're looking for, you may find it in their listing.  (They're also selling software with quotes by women; I can't speak for the quality of the software.)