Airhealth.org
   Provides information about Economy Class Syndrome and offers DVT prevention tips for pilots and passengers, treatment information, research, and a review of how well various airlines inform their passengers of the risks of blood clots from air travel.
   http://www.airhealth.org/

British Society for Haemostasis and Thrombosis
   Dedicated to the advancement of public education and the promotion of those branches of medical science concerned with haemostasis and thrombosis. Features history, membership information, bursaries, news, and meeting schedule.
   http://med6.bham.ac.uk/bsht/

CBC News: The Perils of Travellers' Thrombosis
   Background on the cause, symptoms, and treatment of Economy Class Syndrome with links to related news stories.
   http://www.cbc.ca/news/background/thrombosis/

Coalition Formed to Raise Awareness of DVT
   Article describing the goals of the Council for Leadership on Thrombosis Awareness and Management. [Requires free registration]
   http://www.medscape.com/viewarticle/426817

DVT.net
   From Sanofi-Aventis Pharmaceuticals. Information on the causes, symptoms, and treatments of deep vein thrombosis, pulmonary embolism, and stroke. Includes free membership area with health tips and tools.
   http://www.dvt.net/

DVT.org
   Features their Best Practices: Preventing Deep Vein Thrombosis and Pulmonary Embolism manual in HTML and PDF formats plus information about the treatment of thrombosis.
   http://www.outcomes-umassmed.org/dvt/

Diagnosis of Pulmonary Embolism
   Canadian Medical Association journal article describing how these blood clots are diagnosed.
   http://www.cmaj.ca/cgi/content/full/168/2/183

Economy Class Syndrome
   Features description of risks and symptoms, prevention tips, information about compression hosiery, and links to related articles.
   http://www.economyclasssyndrome.net/

Four Corners Online: Economy Class Syndrome
   Archive of a 2001 discussion prompted by a young British woman's death following a vacation in Australia.
   http://www2b.abc.net.au/4corners/sforum60/

Investigators Against ThromboEmbolism (INATE)
   Information about the prevention and treatment of venous thromboembolism. Includes information for patients and a restricted area for registered health care providers only.
   http://www.inate.org/

Lower Extremity Venous Anatomy and the Use of Ultrasound for Detecting and Diagnosing Thrombus
   Article describing how ultrasound is used to diagnose DVTs in the lower extremities.
   http://test.cvtcollege.org/Ac_Programs/dms_vascular/studentErika.html

Medical Experts Unite to Raise Awareness of Risk, Threat of Blood Clots
   Council for Leadership on Thrombosis Awareness and Management formed to advance prevention and treatment of thrombosis. Includes disease description and council's education plans.
   http://www.eurekalert.org/pub_releases/2002-02/m-meu021302.php

New England Journal of Medicine: Thromboembolism
   Collection of articles covering topics such as embolic complications and thrombolytic therapies. Includes research articles, case reports, reviews, and editorial commentary. [Paid registration required to view some recent content]
   http://content.nejm.org/cgi/collection/anticoagulantsthromboembolism

Pulmonary Embolism
   Article by Craig Feied, MD, detailing the background, diagnosis, and treatment of pulmonary embolism.
   http://www.emedicine.com/EMERG/topic490.htm

Severe Pulmonary Embolism Associated with Air Travel
   Article from the New England Journal of Medicine. [Free registration required to read full article]
   http://content.nejm.org/cgi/content/abstract/345/11/779

The Australasian Society of Thrombosis and Haemostasis
   Represents clinicians and scientists committed to promoting and fostering knowledge relating to haemostasis. Includes mission, meeting minutes, newsletters, membership information, members-only discussion board, and related links.
   http://www.asth.org.au/

The National Alliance for Thrombosis and Thrombophilia (NATT)
   Includes organization background, events, and links to further information.
   http://www.nattinfo.org/

The Sol Sherry Thrombosis Research Center
   Features center information, staff biographies, list of seminars offered, and links to resources.
   http://www.temple.edu/sstrc/

The Thrombophilias: Well-Defined Risk Factors with Uncertain Therapeutic Implication
   Annals of Internal Medicine article.
   http://www.annals.org/issues/v135n5/full/200109040-00013.html

The Whiteley Clinic
   Information about economy class syndrome and deep vein thrombosis (DVT) including precautions for air travel.
   http://www.economy-class.co.uk

Thrombosis Crisis in Hospital Medicine
   Free continuing medical education symposia from American Health Consultants on acute thrombosis management in emergency medicine.
   http://www.ahcpub.com/ahc_root_html/products/conferences/thrombosishm_aventis2003.html

Thrombosis Interest Group of Canada
   Detailed information on blood clots. Explanations and treatment options.
   http://www.tigc.org

Thrombosis Research Institute
   A multidisciplinary organization concerned with the interrelated problems of thrombosis and atherosclerosis. Provides articles for professionals and consumers.
   http://www.tri-london.ac.uk/

Tim Hentzel's Deep Vein Thrombosis
   Essay and weblog describing one man's experience with DVT.
   http://www.hentzel.com/clot.htm

Travellers Thrombosis
   From Dr. P. C. Malone, offering research papers, articles, and DVT information.
   http://www.travellersthrombosis.co.uk/

Yahoo! Groups: Thrombosis
   Discussion mailing list for sufferers of deep vein thromboses, pulmonary emboli, and other vascular disorders.
   http://health.groups.yahoo.com/group/thrombosis/

eMedicine Health: Blood Clot in the Legs
   Provides information on causes, symptoms, and treatment of deep venous thrombosis.
   http://www.emedicinehealth.com/articles/10885-1.asp

eMedicine Health: Phlebitis
   Provides information on the causes, symptoms, and treatment of phlebitis.
   http://www.emedicinehealth.com/articles/11161-1.asp

eMedicine Health: Pulmonary Embolism
   Provides information on the causes, symptoms, and treatment of pulmonary embolism.
   http://www.emedicinehealth.com/articles/17711-1.asp