I don't really care as much about the subject matter of stuff submitted here, as long as the chosen subject hasn't been already exhausted.
What I do care about is that it be in an acceptable form, and here on kuro5hin that means: write-up. Give some background, do some research, include lots of informative facts and links, and make something more out of it than a link and a single paragraph that equates to "what do you think?"
I believe that using this form is at least as important as choosing a good subject/story. I often find myself getting interested in articles that are about things I know little or nothing about, because they give a good, informative view of the factors involved; something your brain can chew on even without knowing all the facts. In this way you can interest "newbies" in your subject while providing new information to readers of all other levels.
In fact, this was how I got interested in Linux at first; I read some things online that were not really meant for newbies, but they had a lot of information and links. I began reading more, filling in the blanks and assuming things, revising my assumptions, etc. Pretty soon I found I had learned quite a bit through this kind of osmosis.
Also: Please stop double-submitting stories. If you hit submit and you don't like the way it turns out, you can't just hit the back-button, change it and hit submit again! Use the preview button every time you revise it, 'cos once you hit Submit, it's in the queue and there's no changing it.