It seems that so many new questioners ask poorly worded questions, or tag their questions incorrectly or misleadingly. Since there is a sidebar describing how to format, how to ask, and how to tag, would it be worthwhile to mention certain oft-seen problems? For example, "please tag this as homework if it is homework?" Also, so many new users ask short questions, and then the first 5 comments they get are "please show us your code," or sometimes very insulting versions thereof. Perhaps users with a rep less than some threshold should be told "your question appears too short. please provide code or more detail."
I know that there are always improvements that can be made, and I assume that somewhere there is a ridiculously long list waiting to be voted up and/or addressed. It just seems to me that if new users could be prevented from asking poor questions, or if they received more guidance asking questions early in their SO career, their first experiences would be improved. I know there will always be some who ignore on-screen guidance, but I suspect some normal and potentially useful contributors are scared off after their first round of insults.