part of sitemap.xml before editing bbpress_sitemap.php

<loc>://</loc>
<lastmod>2009-02-11</lastmod>
<changefreq>monthly</changefreq>
<priority>0.2</priority>

and the same after editing:

<loc>http://forum.go41.de/tags/sidebar</loc>
<lastmod>2009-02-11</lastmod>
<changefreq>monthly</changefreq>
<priority>0.2</priority>

What to change in bbpress_sitemap.php Version: 0.6.1:

in line 122
get_tag_link replace with bb_get_tag_link
in line 138
get_tag_page_link replace with bb_get_tag_page_link

this helped to get the correct link to tag pages in the sitemap

I edited this bbpress_sitemap.php on line 16 to look like this:

$sitemap_file = $_SERVER['DOCUMENT_ROOT']."/sitemap.xml";

as my bbpress is installed in the root folder of a sub-domain, the sitemap.xml should also be in the root.

After changing the reference to the location of this file (sitemap.xml) I uploaded bbpress_sitemap.php to the new created my-plugins folder.

Before enabling it I created an empty file sitemap.xml in the root of the forum and set the rights to 777.

I enabled the plugin and to trigger the sitemap creation just opened one post and saved it. With FileZilla ftp client I could see that the previously empty file now increased in size - it was successfully created

Still get problems with empty links to tag pages however...

The content of my current robots.txt file is now:

User-agent: Mediapartners-Google*
Disallow:

sitemap: http://forum.go41.de/sitemap.xml

Actually I disallow most of the folders, still would like to disallow 'login'

Sitemap I use is from: http://boakes.org/download/bbpress_sitemap.txt