Almost there!

...I was going to say that the new system is almost finished and post a screenshot of /post/browse, which is currently working (again). But then I decided to upload a new image, and so I did, but I noticed a couple of bugs so yeah...

Anyway, the new system is almost finished! Gonna be released soon... Real Danbooru / Oreno.Imouto for PHP. Or at least that's how it works.

It updates!

The new MyImouto system can now update posts. It's slowly getting rebuilt.
The code:

Top: New MyImouto; Bot: OrenoImouto

It's beautiful compared to the 46 lines of code of the current update function...

Finally finished

After a long time I'm finally done with this thing.
It's been hosted here: http://code.google.com/p/my-imouto-booru/. It has been moved to GitHub: https://github.com/myimouto/myimouto. Information is also there.
Here you can see some more pictures.
[Edit]
Oops, any date in comments say "31 Dec 1969". Fixed that in the code.

Sidebar is there, although it doesn't work exactly like in Imouto.

Pools...

You can have your own dovac...

...and your own petopeto.

Danbooru style included.

Browse mode.

Danbooru + Yandere (Moebooru) port to PHP and MySQL

[Update 2014-01-27]
The system grew from being an "emulator" as I called it at first, to be an actual port of Moebooru to PHP. If you're looking for the files, you can find them in Github here.

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Before I decided to work on this in 2009, I don't think I made a deep search on a Danbooru-like page for PHP.

(Defining variables here)
Anyway, I'm not even sure how to catalog Danbooru (just in case, there're tons of 18+ pics there), but it's an image board that works with tags, you can download and use its source code to make your own Danbooru. Sadly, it's made on Ruby and works with PostgreSQL I think? Not Windows-user friendly.
Then we have Imouto, based on Danbooru but modded for good, cooler than 'booru I'd say.