Well, Wikipedia is a special case, and perhaps newspapers are as well. I would be inclined to mark errors, perhaps with links to footnote corrections, rather than to inline edit. I naturally would make an exception for (most) mere typos.
If something is said clumsily and the author wants to fix it ... that's a tricky one. My feeling is that the old version should be at least archived in the case of editing. Old essays are, in addition to being essays, records of how one used to write. Such records are valuable, and likely should be preserved.
Re: newspaper errata & corrections
If something is said clumsily and the author wants to fix it ... that's a tricky one. My feeling is that the old version should be at least archived in the case of editing. Old essays are, in addition to being essays, records of how one used to write. Such records are valuable, and likely should be preserved.
(P.S. Blink tag? Evil! ;)