Well I can't say that the site is entirely unique. It is the classic wiki and the content that users have put into it so far is not exactly consistent and highly informative. One tutorial will have screen shots, the other will not. One will have a well thought out tutorial and the other barely forms two paragraphs. You also have topics like PHP, PHP 4, PHP5 which probably should be redirected to PHP to condense material and provide more information on the topic of PHP in general.
It is a good start so far and while I am not exactly compelled to write content for your wiki, someone out there may enjoy helping you out. Keep in mind that you want to show some kind of benefit (besides the Adsense ID) to contribute the work to your project.
Not too bad overall, just grow it some more.
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