I am currently working on articles for my site. Each article is actually a series of articles, so I can keep 20 page articles to a more palitable size.
I'm currently working on three series, all with a security focus:
1) encryption in php - some of my code for these is already in the coding critique forum. I'd like to work up to implementing aes but I don't think I'll be able to due to exportation restrictions on encryption in the US. However I do plan on implementing s-des and showing some basic techniques for more advanced encryption.
2) locking down a site with php - hot link prevention, unauthorized access prevention, forcing secure connections, etc.
3) security testing with php - port scanners, password crackers etc. The focus of these articles is not to help others hack but to help security profesionals understand the power of php in this area.
I cannot pay for any work done but if any one would like to write some articles I'd be more then willing to discuss it with them.