I'm signed up to teach a community education course on OSX at a local college, a three-hour session on a Saturday morning in June. It's being billed as "Anyone can become an OSX Power-user," geared towards new Mac users and longer-time users who haven't explored OSX very deeply. I've divided the course into roughly three sections: tricks and tips (shortcuts, etc), maintenance, and cool tools (useful freeware). This will be a demonstrations course, as opposed to hands-on (partially Keynote, partially live). I figure I need about 2- 2 1/4 hours of material, allowing for breaks, discussion and questions. I'm in the process of building up my course outline and presentation. I have quite a bit of material prepared already, but I don't want to miss anything good. So my question to the MR folks is: Given the intended audience, what do you think is essential to cover in a short period of time, particularly in the tricks, tips and shortcuts category?