Sheldon and Geoff suggest:
But anons and new users do have a tendency to save without first previewing. I would therefore support the removal of the Save button
from the initial edit screens presented to anons. Only after they previewed once would they be presented with the save button.
That is such a simple & brilliant solution that I wonder why no one else has thought of it until now. Such a change would not be a serious barrier to someone who wanted to make the contribution without logging in: the forum on Linux Weekly News requires a preview step for its members to submit input, & I'd say that place has a high signal-to-noise ratio. It would also encourage the creation of more accounts, which would draw more people in.
Developers, please hide the "Save" button for newbies (like IP users and those recently signed-in) -- thus requiring them to PREVIEW each page submitted. (Un-hide the button, of course on the preview page :-)
We can try the experiment for a couple of weeks, and see if it has good effects. What do you say?
Ed Poor Wikien-l Admin