For the sake of it with things progressing further toward open-source, I've made the entire Insert Coin PHP source code (as of June 24, 2008) available for download.

http://www.4shared.com/file/52584333/d1386c3d/insert_coin_2008_6_24.html

In my relative hurry to get the site up and running, the commenting is sorely lacking, but that will progress with time and future updates made available.

I use two different freely available PHP utilities, on top of my own code:
-HTML Purifier
-phpThumb

And two freely available JavaScript utilities
-Prototype.js
-tinyMCE