Add plain to do list

It should contain a plain to do list, without reminders and notifications. As i go on completing the tasks, it should be deleted automatically. I need a to do list handy. It would be good if it works just like the Clock works. I should be able to choose the opacity level of the to do list. It need not relate to a single day, it may be things i need to complete in the coming month. I dont want to assign any timeframe for it.