What are the url's of your pages??? What has Google cached? What do you want Google to cache? What do you want shown on the serps. If the url includes strings as part of the url, then that is the url of that page.

In vBulletin standard, all the threads are url strings, and that is what you want cached by Google, therefore in the sitemap. Same for any other page.

well, that makes sense. thanks!

when i run the creator it pings with no errors, however all the links it creates are missing the forums directory.

/vbgsitemap/files/

but it should be

/forums/vbgsitemap/files/

How do I uninstall this hack?

you delete the files you uploaded when you installed it

would this work with DeanC's SEO vb URL Rewrite hack: https://vborg.vbsupport.ru/showthread.php?t=91324 ?

no it wont :)
it will use VBSEO though

check the config file and make sure that you have your forum directory in there:
$base="forums/"; // "" if in root, $base="forum/"; //if in the subdirectory forum

The vbgsitemap is off the root directory so that not only can you add vbulletin url's, but your other url's. The vbgsitemap.php needs to be in the root, so that Google can add url's off your root as well. vbgsitemap.php accesses the actual files in the /vbgsitemap/files/ directory

What exactly does this hack do? Help!

Google has got a site map system whereby you tell it the url's of your website, and it is then able to find them easier. You can diret it to look at the url's less often than they would normally (ie if content doesnt change too often) and so save bandwidth, or for google to check more frequently if content is often changing.

It is especially good if you have lots of new threads being created. The sitemap will show the create date of those threads and google should find them faster than otherwise.