phpBB Google Sitemap Generator
The phpBB Google Sitemap Generator is a script that will present several sitemap files to Google when it requests them (you have to submit to Google initially). This script is aimed at every size and style of phpBB forum regardless of whether you have just a few hundred posts, or tens of thousands of threads. Features include configurable URLs to forums & posts (for those of you that have implemented mod_rewrite modifications) and support for an unlimited number of forum areas.