I'm also a College instructor.
I use Sven Fritsch's "hide/unhide desktop" workflow to hide my desktop icons when I need to mirror my screen on a smart board or projector, and I don't want the class/audience to see whatever I have on the desktop.
I use "prepend to file" as a collector for details and ideas. I created an "ideadrop.txt" file that lives in dropbox, and when I stumble across something I want to remember (things I might want to use in a class at some point) I prepend it to that file without having to leave what I'm doing. Every time I open the file, the newest stuff is right at the top. Periodically, I open it up and file all the individual bits of info into places where they will be useful. Incredibly useful when I'm in data collection mode and I don't want my actual desk littered with little bits of paper.
"Create new file in Finder" is useful when I'm developing content. Often, I think of something else I need to create while I'm in the midst of something; the workflow allows me to quickly create a relevant document, without leaving what I'm doing, and without having to open the piece of software to create a new document.
"Eggtimer" has all kinds of uses in a classroom.
