Digital Urology Journal -
 Details about urethritis such as signs and symptoms, causes and treatments.
http://www.duj.com/urethritis.html

eMedicine Health - Urethritis -
Consumer health resource center providing information on the causes, symptoms, and treatment of this disorder, an inflammation of the urethra.
http://www.emedicinehealth.com/articles/18831-1.asp

McKinley Health Center -
 A definition of nongonococcal urethritis as well as details like the causes, signs and symptoms and treatment.
http://www.mckinley.uiuc.edu/health-info/dis-cond/commdis/ngu.html

Non Specific Urethritis -
 A definition of this disorder as well as some essential facts for men and diagnosis and management guidelines.
http://www.stdservices.on.net/std/nsu/

Royal Adelaide Hospital -
 Non-specific urethritis and urethral irritation. Essential facts for men, details for students and clinicians and diagnoses and management guidelines. Also an informational pamphlet in PDF format.
http://www.stdservices.on.net/std/nsu/default.htm

Urethritis, Male from Emergency Medicine -
Authored by Walter Elrod MD. An in depth look at this disease including the work up, treatments, medication and follow up.
http://www.emedicine.com/emerg/topic623.htm

UW Student Health Services -
 An article about non-gonococcal urethritis with details such as symptoms, diagnosis, treatment, prevention and what happens if left untreated.
http://depts.washington.edu/hhpccweb/women/NGU.html

WebMD -
 A definition of urethritis and the causes, incidence and risk factors, symptoms, signs and tests, treatment, prognosis, complications, prevention and when to call a health care provider.
http://my.webmd.com/content/healthwise/