The CDC is also an good source for practical advice, like the handwashing guide below. Click the image to the right to see more CDC Health Promotion materials on handwashing.
Other good sources of easy to understand medical information are:
Consumer/patient-oriented health information from the National Library of Medicine and NIH, in both English and Spanish with selected resources in over 40 languages.
Some of the best quality information on the web from the venerable (and now updated monthly) Merck Manual. The News section addresses medical information that has made the news--without the hype.