National Ovarian Cancer Coalition - Very informative, includes everything from doctor search to clinical trial in addition to risk factors and resources.
Ovarian Cancer National Alliance- Provides information for the newly diagnosed, survivors and those with just a general interest.
National Cancer Institute - A completely comprehensive site with information on ovarian cancer, as well as all other types of cancer.
Ovarian Cancer Research Fund, Inc. - This site is dedicated to finding a cure and providing support to patients and their loved ones.
About: Women's Health - Here you will find a brief overview and tons of links to other sites with information on ovarian cancer.
Ovarian Cancer Info. - Information on the origins of ovarian cancer, its symptoms and managing the disease.
OncoLink: Abramson Cancer Center at the University of Pennsylvania - A basic overview of ovarian cancer and more in-depth links.
The Whisperings of Ovarian Cancer - An article about ovarian cancer and its warning signs.
Harvard Center For Cancer Prevention - Here you can take a risk assessment questionnaire.