4 links
Many-Valued Logic
plato.stanford.edu
Survey article on multiple-valued logics, by Siegfried Gottwald. From the Stanford Encyclopedia.
Multi-valued Logic Home Page
ee.pdx.edu
Links to journals and researchers in many-valued logic, bibliographies, and conferences.
The Logic of More
ternarylogic.com
Analysis of a ripple adder in binary logic and alternative designs in ternary and multi-value logics.