All About Outliners
Ted Goranson has completed a comprehensive discussion of outliners for ATPM (part 1 | part 2).
Goranson's discussion lists nearly every "feature" that outliners possess, or could possess -- good, bad, indifferent, and irrelevant. This is, of course, the favorite vice of magazine reviewers, and back when computer magazines mattered it led to absurd feature wars. Software companies would add badly thought-out and badly implemented features, one after another, just to make sure their product got more checkmarks than the competition. The result, of course, was blight: one huge program with lots of features, no coherence, no competitor, and no further development. Word, or Internet Explorer.
But, just this once, I'd make an exception: Goranson's list of features is so comprehensive and intelligent that it makes a real contribution.