Friends, advertising people and activists - especially all you
technophobes - here's an absolutely wonderful concept I'd like to point you towards. It will get you a much larger audience than, for example, a blog would. But then, so would the sound of one hand clapping. Anyway.
"Apart from actual prisoners, you won't find a more captive audience than people in their cars," the site says, and goes on to explain:
"Here's what you do:
1) Put paint on cardboard
2) Put cardboard on freeway
3) Repeat"
Now head thee to http://www.freewayblogger.com and check out the wonderful examples they have up there. And if you're considering doing a little lo-tech blogging yourself, do check out their "How To" page