First, when writing an article, make it use the UBB type code buttons, making inserting code easy, and easy to mark up properly.
Secondly, when writing articles, you should be able to add multiple pages (see Anandtech.com for a good way to implement it). Maybe just adding something like "Insert New Page" and another blank page to write stuff on, but linking back to other pages just to be able to edit it.
Just my simple suggestions, I wish there was a way I could help with the design of it (not the programming, I don't know PHP), but I can certainly help you to spruce up user logins, and make things easier to navigate.
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