This post was published more than a few years ago (on 2007-04-16) and may contain inaccurate technical information, outmoded thoughts, or cringe takes. Proceed at your own risk.
For those of us that are incapable of using just a simple pencil and paper to keep track of your "detective notes" while playing clue, here's an OmniOutliner template with pop-up lists for checking off whether you have it, or one of the other players --- all six player names are included for completeness, or replace them with the actual names of the people you're playing against.
OmniOutliner Template (4 KB) (May require OmniOutlinerPro to edit.)