I created a spreadsheet to track students' homework submissions and grading of them - it's easy to lose track when everything is electronic (I've no printer at home, and would prefer not to print anything out anyway).

The end of week 4 and only 10 of the 14 students have their homework in that was due a week ago. I was lax up to now, but there's a danger in them falling behind, so I have to turn up the heat a little on the slackers.