Tutorials I have written for phpBB 2.0.x are listed:
An overview of the $userdata variables, as well as working examples which you can use on your own forum.
How to use phpMyAdmin
An easy-to-follow tutorial, with pictures, explaining how to use phpMyAdmin to execute queries when installing MOD's.
Adding Adsense to phpBB2
Many forum owners want to add Google Adsense to their phpBB2 forums. This article explains how to add Adsense to index_body.tpl, viewtopic_body.tpl and viewforum_body.tpl.