Google sitemap

You don't really need google sitemap for punbb .... My forum is indexed just fine. Very fine I might add     Google will find you anyway

There's an option for it to output the results to XML files
And since when does the sitemap need to end in .xml? The PHP file should work perfectly

You can put XML data in a file and give it any extension you want. However, I don't know if that causes any problems with Google. (I use .xml.gz myself.)

helpme: That says nothing about a file extension nor does it say anything specifically about PHP. Since this is how I've seen a lot of sitemaps generators written, I have a feeling you're wrong.
Have you tried to add the page as a sitemap?

Edit: That page is talking about the content of files, not the type of files. My PHP generates XML that follows those guidelines

It's useful to ensure ALL of your information gets crawled (at least). It's especially useful with longer topics

It works now and really good! I can really recommend using this tool. 5 days ago I had like 300 pages indexed, now I have 5000! awsome.

I have absolutely no problem with the sitemap.php mod for PunBB. Google use it without errors.

Can you give me an example of the duplicate URLs?
And it generates valid XML. Why would you need an actual .xml file (although the script does generate it if you set $dynamic to false)?