Several sample sites using PHP on 10gen.

The "basic" site is meant as a proof of concept of a PHP site running on 10gen. 
It also contains some tests showing various functionalities of 10gen's PHP support. 
Implementations of tutorials for PHP are forthcoming.

Then "student" site is a PHP implemention of the student web app, it is currently 
incomplete but is being actively worked on.

Tutorial documentation can also be reached from our main developer documentation
page, here: http://www.10gen.com/wiki/DevDocumentation