Cells Alive http://cellsalive.com/cells/cell_model.htm
Link # 2 http://www.wiley.com/legacy/college/boyer/0470003790/animations/cell_structure/cell_structure.htm
Animated Cell http://www.nsf.gov/news/overviews/biology/interact01.jsp
University of Wisconsin Cell Model http://wisc-online.com/objects/index_tj.asp?objid=ap11403
Target Practice Quiz http://www.zerobio.com/target_practice_quiz/target_practice_quiz_cells.htm