I feel the difference between do and suggest is of great importance in such situations as this. No one can argue that the suggestion of new "free" software is a bad one to any user. Simply implementing your own personal choice on someone elses property is completely wrong though. When I give talks with presentations I always use open source software and it is amazing how often people come up to me afterwards and say "that looked so much better than powerpoint what is it?" or "What browser was that you used?" My personal oppinion is by letting people know it is there anyone who will be a benefit to the community of oss users will eventually catch on.