A very simple grocery and/or scratch list app.
When I got my first Android device I was dismayed that I couldn't find a truely simple way to just jot things down and then mark them completed. Everything I found was either laden with ads, needed to be categorized in to some database, or was implemented with unecessary graphical flair.
This application just stores a single list of items and allows you to check them off. You can remove individual items, all checked items, or completely empty the list. That's ALL. Enjoy! :-)