[keenrodent]

Anecdotally I have had some success getting judges to think of IP addresses mapping to individuals like they already think of post office boxes mapping to individuals.

For example, a post office box is a real address, but what goes in can be put there by anybody with access to the box, whether it's with the key from the customer side, or from the open back from the post office side. Similarly, what goes out can be removed by anyone with access to the open back of the box, or from the front with a key. No one checks to ensure that the holder of a key is the owner of the box.

Of course this is a very blunt metaphor, but with it one can see the light go on....

[ryacko]

Given that people probably understand the postal system as well as they do any other network, it would be the best metaphor.