The Art of Imaging from Invitrogen (via Molecular Probes’ protocols for pretty pictures). See interesting images and details on exactly how to scientists create such images.

image: -catenin in HeLa human cervical cancer cells was labeled using mouse anti–catenin and visualized with Alexa Fluor 488 goat anti-mouse IgG (green). Filamentous actin was visualized using red-fluorescent Alexa Fluor 635 phalloidin. Nuclear DNA was stained with blue-fluorescent DAPI. Larger photo and more details

The image gallery includes many more images.