I have been using Evernote for a while, but have never really gotten into it even thought it is a very hot app and has come up with many cool ideas. What I really need is just a place to quickly list items such as what I need to buy at the grocery store or a quick picture.
So along comes Google Keep which is very much an Evernote lite that seems perfect to me as it syncs with the page online, but on the smartphone it lets you take pictures and even record your notes. So if you have some quick teaching ideas and don't want to take much time with them you might want to try it. Here is the Android App.