Here are some usefull links regarding Self Organising Maps or Kohonen self-organising feature maps.



Theory:

Description of SOMs with light algorithms
http://www.daimi.au.dk/~bek/thesis_html/node54.html

Labeling SOMs (supervising them)
http://www.daimi.au.dk/~bek/thesis_html/node56.html

Description of SOMs with lots of equations
http://www.sbc.su.se/~maccallr/thesis/node137.html

Light Description of SOMs with examples in MATLAB
http://divcom.otago.ac.nz/infosci/courses/info331/2002/LabBook/pdf/Lab8.pdf

A nice little overview of SOMs with a good graphical example (theory only)
http://www.shef.ac.uk/psychology/gurney/notes/l7/section3_3.html


Example Implimentations (applets mostly):

A good applet explaining SOMs. One for colour and another using the normal grid example.
http://physchem.ox.ac.uk/~hmc/papers/chedr2000a/chedr2000aindex.html

A lovely Applet Example of a simple SOM
http://www.arch.usyd.edu.au/~rob/java/applets/neuro/SelfOrganisingMapDemo.html

An exceptional description of SOMs with a very good applet to demonstrate (colour)
Also has lots of good links.
http://davis.wpi.edu/~matt/courses/soms/index.html