http://www.webmd.com
2. drkoop.com
http://www.drkoop.com
3. Health Central
http://www.healthcentral.com
4. Mediconsult.com
http://www.mediconsult.com
5. OnHealth.com
http://www.onhealth.com
6. PersonalMD.com
http://www.personalMD.com
7. IntelliHealth
http://www.intelihealth.com
8. PDR's Getting Well Network
http://www.gettingwell.com
9. beWELL.com
http://www.bewell.com
10. HealthAnswers
http://www.healthanswers.com