From the National Institutes of Health
Lyme Disease - The Facts, The Challenge (National Institute of Allergy and Infectious Diseases) - Links to PDF File Overviews
Lyme Disease (American Academy of Family Physicians)
Lyme Disease (Arthritis Foundation)
Lyme Disease (National Center for Infectious Diseases)
Lyme Disease (Patient Education Institute) - - requires Flash plug-in Also available in: Spanish

Pictures/Diagrams
Picture Gallery: Rashes (Lyme Disease Foundation) - Lyme Disease rashes
Picture Gallery: Ticks (Lyme Disease Foundation)

Diagnosis/Symptoms
Lyme Disease Test (American Association for Clinical Chemistry)
Lyme Disease: A Patient's Guide, Diagnosis (American College of Physicians)
We Want You to Know About Lyme Disease: It's Difficult to Diagnose (Food and Drug Administration)

Treatment
Chronic Lyme Disease Symptoms Not Helped By Intensive Antibiotic Treatment (National Institute of Allergy and Infectious Diseases)
Lyme Disease: A Patient's Guide, Treatment (American College of Physicians)
Tick Removal: A Step-by-Step Guide (Nemours Foundation)

Clinical Trials
ClinicalTrials.gov: Lyme Disease (National Institutes of Health)

Specific Conditions
Neurological Sequelae of Lyme Disease (National Institute of Neurological Disorders and Stroke) - Short Summary

Prevention/Screening
Lyme Disease Vaccine: What You Need to Know (National Immunization Program) - Links to PDF File
Spotlight On: Protecting Yourself and Your Family from Lyme Disease (National Center for Infectious Diseases)
Tick Tips: Protect Your Family from Lyme Disease (Centers for Disease Control and Prevention)

Related Issues
Lyme Disease and Pets (Lyme Disease Foundation)
Lyme Disease: Health Information for International Travel (National Center for Infectious Diseases)

Research
Lyme Disease Research Efforts of the National Institute of Allergy and Infectious Diseases (National Institute of Allergy and Infectious Diseases)
Lyme Disease Vaccine: Preventing an Emerging Disease (National Institute of Allergy and Infectious Diseases)
Secrets of the Woods: Acorns, Biodiversity and Lyme Disease (National Institute of Allergy and Infectious Diseases)

Dictionaries/Glossaries
Lyme Disease: A Patient's Guide, Glossary (American College of Physicians)

Organizations
American Lyme Disease Foundation
Arthritis Foundation Also available in: Spanish
Lyme Disease Foundation
National Center for Infectious Diseases
National Institute of Allergy and Infectious Diseases

Children
Lyme Disease (Nemours Foundation)
Recipe for Tick Soup (Agricultural Research Service)

Teenagers
Lyme Disease (Nemours Foundation)
What's My Lyme Disease Risk? (Nemours Foundation)