Hi there. First of all, just to say what a great sight you have going here - much more user friendly than linux.org (in fact I was looking for a site like this a while before you made it). To begin with I was your standard Windows user, but now I am beginning to switch to Linux (Ubuntu if you're interested).
Great campaign with a great objective - the million dollar question is can we promote it. I was browsing around the Ubuntu forums and found some good ideas. Maybe we could try to publicise using posters and leaflets, so that we don't have any advertising costs (although a newspaper as already suggested would be the best idea). Ultimately, could we pull some people together to work on a video advert (another suggestion from Ubuntu forums) or maybe have a competition like Mozilla did for firefox.