Cells Alive  

This is an award-winning site devoted to capturing film and computer-enhanced images of living cells and organisms for education and medical research. 

Eureka ! Science
Another award-winning site.  This is designed for younger students, but there is plenty of information and pictures.  Look for the “Cells” link and then click on either “plant” or “animal.”

Biology Research Overview
Sponsored by the National Science Foudation and featuring an interactive tour through a three-dimensional image of a human cell, complete with numbered parts, cutaways, and detailed explanations.

General Plant Biology: Plant Cells
Sponsored by Ohio State University, this site has a higher level of information the previous sites, but the explanations and pictures are easy to study.  Illustrations include photos and sketches.

The Cell
An award-winning site sponsored by the John Jay College of the City University of New York with drawings, photos, and easy-to-read information.

The Biology Project
An interactive educational resource geared toward high school and college biology students sponsored by the University of Arizona.  Lots of links.  Lots of pictures.

Biology-Online.Org
An online biology tutor.  There are no pictures in this sight, but every term is linked to the complete definition.

BioChemHub
A free on-line learning center.  Scroll down the main page until you get to the eight different Cell Biology links.  Some are rich with animation.  Others have drawings and pictures.  All have lots of information.

Teoma and Ixquick are two search engines you should try.  They feature a detailed description of each site and offer suggestions for how to get more specific with your search.  Ixquick also ranks the sites.