http://neurosurgery.mgh.harvard.edu/vaschome.htm#AVMs
This site has a lot of text explaining about strokes, aneurysms, and other phenomena related to cerebral circulation. There are many links to other medical centers that contain diagrams and images of angiograms.

The Congenital Heart Disease Resource Page provides information for parents on diagnosis and treatment of heart disease in their children.

http://sln2.fi.edu/biosci/heart.html
This web page has an open heart movie (requires QTV) as well as other attractive graphics, plus activities related to EKGs and x-rays.

http://www-medlib.med.utah.edu/WebPath/ATHHTML/ATHIDX.html
Photomicrographs of atheroscleroses and thromboses and pictures of an infarcted heart are featured here.