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.usc.edu/hsc/pharmacy/ced/dietchol/DietChl2.htm
A technical discussion about the relationship between free radicals and atherosclerosis.

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