Frank pointed me towards some pretty interesting mind mapping software called FreeMind. It helps you think through a subject in any level of detail you like. Once you get started it can be hard to stop.
I have made a mind map about ID Cards – you will need Java in order to view it. Be patient – it can take a little time for the Java applet to load. Once it has loaded you can open a thread by click on it.
I think this is a cool programme!