Or have a look at the following links (suggestions are always welcome):

Molecular Expressions (Simply, the best!) @ The Florida State University

CLMIB Center for Light Microscope Imaging and Biotechnology. An NSF Science and Technology Center @ Carnegie Mellon University.

LOCI Laboratory for Optical and Computational Instrumentation

LONI Laboratory of Neuro Imaging @ UCLA School of Medicine

SPL Surgical Planning Laboratory @ Harvard Medical School

Biofluorimetry Lab @ Dipartimento di Fisiopatologia Medica - UniRoma "La Sapienza"

Image Processing Laboratory @ Universitätsklinikum Giessen, Germany

Southwest Museum of Engineering, Communications and Computation - Home of a nice "Microscope History"

W.M. Keck Center for Cellular Imaging @ University of Virginia

CCI - Center for Cell Imaging @ Dept. Cell Biology, School of Medicine, Yale Univ.