Are You a Lister?

I have lists going all the time.  Groceries, check.  Books I want to read, check.  Chores that need to be done, check.  Project that need completed, check.  And on they go.  I would feel naked without my many lists.  How about you?  Are you organized by your lists or do you toss everything in the air and handle things as they drop?  Either way is fine, as long as it works for you!