So you know how when you type the title it has a completion bar? I think that would be a good thing to have for the answer body, as a step toward encouraging longer more descriptive answers.
Also, suggestions would be good if they popped up when you were posting. Maybe with a list of common tags/issues and such.
Also maybe if when you hit ask a question, something asks you if you maybe want to search for your question before asking it.
Or maybe it's asking to much to have the site recognize common terms and ask the user to see some related posts?
Overall I think this is a good discussion that we're having, just as I stated before, if it gets to complicated or cumbersome, or the community members here are rude, then this will just alienate the askers.