Celettu offers some great ideas on attracting new comments to linux. I especially like his suggestion that you refuse to continue providing free Windows tech support – this has worked charmingly for my own family, if not for converting them then at least for showing that there is a reliable alternative when MSware goes sour. The only tip I would add is to take full advantage of all the shiny graphical customisation available in the linux world. I’ve had two friends approach me asking about Ubuntu purely on the basis of having seen somebody’s sleek desktop setup online.