first off, id like to say, my comments aint to offend you, so dont take it personal, i just want to help you on your site:)
ok here i start off...
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Bad idea, there will only be webmasters submitting articles, and nobody actually reading them, making the articles worthless, i'd suggest you change that and make it more for the viewers, not the webmasters, and on the sidebar or menu, you can have a link saying, "Submit articles" which you already have, so good work there, now for the design, i particularly didnt like the design much, but thats just my own personal oppinion, if you was to make it more colorful, i beleive that it would draw the user to the site, and stick to it to see what you have, little things like that somtimes can have a huge impact, but again, thats just my personal oppinion, apart from that, good work with what you've done on the site, i like it.