Familydoctor.org
This is a nice site of medical information from the American Academy of phyisicans. It has a search option, and is very easy to navigate. There is a section of information in Spanish

Medical Information from the University of Maryland Medical School
This site includes a medical encyclopedia and drug information. There is some information in Spanish, and some other special features.

WebMD
This is a nice website of medical information. There is a search option on the page but it is a basic one. The drug and herb section is good.

BBC Health
This is health information from the BBC and it is well organized and laid out. It has an extensive ask the doctor section. There is also a section about travel health.

National Women's Health Information Center
The FAQ section looks very good. There is a Spanish section. The section on heart health looks good too.