http://studentweb.tulane.edu/~riker/chempoin.html
The chemistry department of Tulane University web site has downloadable chemistry software including clipart.

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

www.knowledgebydesign.com/tlmc/tlmc.html
Movies of models of atoms are shown.

http://www.chemie.fu-berlin.de/chemistry/bio/amino-acids.html
This site includes a list of amino acids. Clicking on the name of an amino acid will bring up another page showing different models of it.