This is a mod for phpBB. It is offered under the GPL license (free). It modifies the subSilver templates to display a better breadcrumb trail. Like this:
If you would like, you can view the readme file that comes with the product.
phpBB Better Breadcrumbs 2.0, 48 KB, released March 22, 2005.
I've added a forum for discussion about phpBB Better Breadcrumbs. Any improvements you make to my patch can be uploaded there.