I don't know about you, but I am a list-maker. I have so many lists and posit notes that I have lists of my lists. A tool I've started using recently is Workflowy.com.It allows you to make lists with sub-lists and cross them off but it stores them in case you ever need to refer back to that list in the future. I have made workflow.com my home page so anytime I turn on my computer my to do list is right there in front of me.
This is a screen shot of Workflowy in action:
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