I've put together an HTML-table form of the genetic code
at
http://golgi.harvard.edu/gencode.html
which provides a supplement to the text form which has long been
on the NIH gopher at
gopher://gopher.nih.gov/00/molbio/gencode
At some point I will get around to listing deviations from the code;
for now, I have cited a slightly-aged but good reference on that subject.
Keith Robison
Harvard University
Department of Cellular and Developmental Biology
Department of Genetics / HHMI
robison at mito.harvard.edu