"Zoomable" Brain Picture
   A set slices from an NMR brain scan, displayed using Javascript so that the user can view them in series by moving the mouse pointer. Non-scientific.
   http://www.mabot.com/brain/zoom-x/

Comparative Mammalian Brain Collections
   Univ. of Wisconsin site has images showing the brain's internal architecture of specimens from over 100 mammalian species for studying differences in brain function and evolution.
   http://www.brainmuseum.org/

Flybrain
   An online atlas and database of the Drosophila nervous system.
   http://flybrain.neurobio.arizona.edu/

The Virtual Human Brain
   Actual human brain dissection images.
   http://www.vh.org/Providers/Textbooks/BrainAnatomy/BrainAnatomy.html

The Whole Brain Atlas
   Excellent MRI views of the normal and diseased human brain. Collaboration of MIT and Harvard Univ.
   http://www.med.harvard.edu/AANLIB/home.html

UCLA Laboratory of NeuroImaging
   Research on brain mapping, structure and function, and related imaging technologies.
   http://www.loni.ucla.edu/