But remeber the some rules of public speaking: Think of your audience when you are writing your speech. If they are not computer literate, then donít use words only a Linux user would use, or you will loose your audience real quick. And remember you are doing an informative, not persuasive, so donít get into bashing windows.
I would start with a short with a good attention getter, something along the lines of stability of computers running Linux, everyone can relate to comp crashes. Then go into a brief history, then, benefits, and maybe the different distros. And conclude it with another statement of stability.
I was going to do a speech on linux but the other students did'nt know crap about computers. I did one on upgrading video, mem, and harddrives. And I felt like I did a bad job when I was looking at the audience, cause all I saw was blank stares. But all is good, I got an A+ for the whole class. Was my last course for my assoc iate degree.