Imaging Technology Group Gallery - Images and brief descriptions of cellular structures and stages of mitosis produced by ITG users and staff - from Univ. of Illinois at Urbana-Champaign. - http://www.itg.uiuc.edu/exhibits/gallery/
Molecular Probes Gallery - Very pretty image gallery demonstrating results using fluorescent probes - from Molecular Probes, Inc. - http://www.probes.com/servlets/gallery/
Image Library from Russell Kightley Media - Scientific Medical Biological stock images. Microbes, viruses, animal and plant cells. Digital illustrations available for license. - http://www.rkm.com.au/imagelibrary/index.html