bootload has started doing this. I think it's good. http://news.ycombinator.com/item?id=26422
Good voting practices are probably more important than good posting practices. Unless, I suppose, the number of stories posted gets so large that people stop looking through the "new" page occasionally to vote up the good stuff.
If you want to be a good samaritan, you can routinely check the new stories to up-mod (sp?) the good stories.
If the community became much larger I think the most effective solution would be to require a minimum of X karma before you can submit. (To prevent 'gaming' you would have to couple this with preventing users with less than X karma from upvoting posts...)
As it is I think a exponential delay before posting (they would sit in a publication queue) would be reasonable, but probably unneeded.