You can find some great photomicrographs of mitosis at this location.

http://www.dcn.davis.ca.us/~carl/cellhome.htm

This site has diagrams of various parts of cells and gives brief descriptions of each part.

http://www.mblab.gla.ac.uk/dictionary/

Click on the structure and search for references on the topics..

http://library.advanced.org/3564/

This site has a gallery of organelles as well as pictures of non-human cells.

http://esg-www.mit.edu:8001/esgbio/cb/cbdir.html

MIT’s cell website has a lot of diagrams and explanations.