Hi, since there seems to be a lot of interest, I figured I could answer all of them at once in a blog post which I'll post sometime tomorrow.

To answer your question though, the backend is running on Python. There's no particular reason. I just find it a lot easier to script with. It's running on fCGI with nginx on the backend server. On the front is PHP... which is served through up by apache. I find it easier for me to do $_GET, hack around forms really fast and also just echo Javascript everywhere.