Strike is a simple To Do Application where users can create a list and then as they get items done on the list "strike" them out...or knock them down. It is as simple as giving your list a name, adding things to the list and then marking them out, moving to the bottom or removing completely. To remove an item from the list you can check the box or click and drag it to the left or right of your list. You can also choose from various backgrounds and easily reorder your list if necessary. Each list has its own URL so you can share it with other users. You can also easily print your list if necessary.
I could see this application being used by students who are collaborating in a group. As each task gets done, the students would Strike them off the list. It would really help students learn organizational skills and provide a way to ensure that all the task for the project get done.