The Ottawa Citizen reports on a study showing that people are less honest, and ruder in email than in person.
The snarkier among us may want to note that the study was restricted to MBA students :-).

For a project involving ikiwiki. I am thinking about the right way (or at least a reasonable way) to encode things into email address. At the moment I am leaning towards a hybrid quoted printable/base64 style approach.

You can have a look at my current implementation of a module Convert::YText to do this conversion.