DNA and Molecular Computation
almost offtopic, but neat; here’s a course on “DNA and Molecular Computation”, with a list of papers such as “Chemical Kinetics is Turing Universal”. I didn’t know so much work had been done on this stuff already! cool!
http://www.cs.caltech.edu/courses/cns288/
(btw, if you’re interested in reading one of the actual articles, here’s Chemical implementation of finite-state machines, which goes into more (computational) detail than “Chemical Kinetics is Turing Universal” actually does).