I have four lists --things to do at my desk, errands, bigger projects, and things that don't fit anywhere else.
Whenever there is a big project (like Christmas) I make a huge list of all the things that need to be done --100s of items long, then sort them in two different ways: time requirements and location requirements. So, I end up with a long list of things that will take 5 or 10 minutes, a slightly shorter list of things that take half an hour, and on up to things that take a whole afternoon. I also have a list of things I can do at home, things I can do anywhere and things I have to do in specific places. Everything's on two lists --times and locations. Because sometimes I realize I have 5 minutes I could do something in, and sometimes I find I'm at the right mall for more than I went for.
And I hate looking back at a half hour of nothing done, or the mall trip, with stuff I've forgotten and could be finished.
at 12:59 PM on Dec. 17, 2010