I get asked this question all the time and I thought answering it publicly was a good idea.
We love it when community members show an interest in posting tutorials for iPhone SDK development. If you have a tutorial you'd like to post, all you have to do is email me at email@example.com
and ask me to put you in the "Tutorial Authors" member group. That's it!
Being in that group entitles you to create new threads in this forum. Please take it seriously in that you have an ability to shape the direction of this forum and the quality of tutorials offered by the community.