University of Washington
University of Washington: Lights,camera,action Potential
This site from the University of Washington is a good site that describes the steps in the process to create nerve transmission. A good page.
Other
Indiana State University: Transmission Physiology
This site has a table of neurotransmitters and their sites of synthesis. It also gives descriptions of the role of neurotransmitters in nerve impulse conduction. Click on a specific topic for more information.
McGraw Hill
Mc Graw Hill: Synaptic Transmission
A graphical look at the process of transmission between two cells.