Why not making a nicely designed cheerful picture pop up when you use any
piece of free software for the first time, saying something like
"You're using free software, contributing to a good future with democracy and
human rights". Then we make a weblink with further explanation.
It would not be a bother if it's for the first time only.
Millions and millions of people are using free software everyday without
noticing. Isn't that a huge potential?
I think it's important to immediately clarify what beneficial consequences
those freedoms imply, like independence from huge coorporation, better
defence against spyware, improved privacy etc.
We have to accept the fact that the sole description of the four freedoms is
a bit theoretical for the normal pc user, if not illustrated with
consequences they can really "feel"