An (not quite recent) overview of existing artifical neural network initiatives can be found in 'Artificial neural networks technology' (a DACS state of the art report by Anderson and McNeill, 1992).
In principle, a more comprehensive classification should include neural network hypercycles of biotic origin and neural network hypercycles of memic origin.
http://www.iis.ee.ic.ac.uk/mirror/students/h-abstracts.html (advocates the role of hypercyclic sets in neural networks)
http://christoph-mac.ucsd.edu/cberger/work/Publications/oc_1998.pdf (recurrent neural networks functioning at the speed of light)
http://www.dsi.unifi.it/neural/pres_spec_issue.html ((special issue on recurrent neural networks)
http://www.ncrg.aston.ac.uk/NN/software.html (website that gives an overview of neural network programmes in C++, also that of CALM webs)
http://citeseer.nj.nec.com/happel94design.html (the paper of Happel)