From the National Institutes of Health
Shingles (National Institute of Neurological Disorders and Stroke) - Short Summary
Shingles: Hope Through Research (National Institute of Neurological Disorders and Stroke) Overviews
Herpes Zoster (American Academy of Dermatology)
Shingles (Patient Education Institute) - - requires Flash plug-in Also available in: Spanish

Pictures/Diagrams
Photos of Shingles (National Institute of Allergy and Infectious Diseases)

Clinical Trials
ClinicalTrials.gov: Herpes Zoster (National Institutes of Health)

Specific Conditions
Herpes Zoster Ophthalmicus (HZO): What You Should Know (American Academy of Family Physicians)
Ramsay Hunt Syndrome Type I (National Institute of Neurological Disorders and Stroke) - Short Summary
Shingles (Acute Herpes Zoster) and Postherpetic Neuralgia (PHN) (Beth Israel Medical Center, Dept. of Pain Medicine and Palliative Care)

Prevention/Screening
Shingles Prevention Study: Common Questions (National Institute of Allergy and Infectious Diseases)

Organizations
National Center for Infectious Diseases
National Institute of Allergy and Infectious Diseases
National Institute of Neurological Disorders and Stroke