Web Sites:

Amnesia & Cognition Unit, University of Arizona: http://www.u.arizona.edu/~pdavidso/amcog.html
Information about a group of researchers and their current studies on amnesia.

Books:

Broken Memories: Case Studies in Memory Impairment, edited by Ruth Campbell and Martin Conway (Oxford, UK: Blackwell Publishers Ltd., 1995).
This book contains a collection of case studies by various scientists, covering all kinds of memory disorders. This includes anterograde amnesia, a severe disruption in the ability to form new memories.

Memory: From Mind to Molecules, by Larry Squire and Eric Kandel. (New York: Scientific American Library, 2000).
Larry Squire and Eric Kandel are two of the scientists at the forefront of memory research. They have produced a very readable book which explains some of the most important concepts of how memory works -- including memory disorders such as amnesia.