I think something should be added at the very least to the right side of the "Ask A Question" page of Stackoverflow encouraging users to provide code if at all relevant to their problem. It happens way too often that someone posts 1 paragraph of "my code is not working, how do I fix it?" with no code in sight. Some kind of nudge towards the fact we're all programmers here and code is the easiest way to see a problem would be nice.
A little past that, it would be nice if that section was somehow "highlighted" for new users, as sadly enough it seems like people just kind of block that right side out when posting questions.