Jim,
At http://www.auditmypc.com/free-sitemap-generator.asp from the beginning you wrote
"Here to generate a sitemap or find errors in your website? There are many types of sitemaps you can create, such as a Google Sitemap, Yahoo Sitemap, XML Sitemap, HTML sitemap and more. All these site maps can be made using our Webmaster Tool.
* Before you jump into this, you should read everything on this page.
Creative website owners have been using sitemaps to get their content recognized by search engines for years. Sitemaps generated by our Webmaster Tool are recognized by all search engines, including Google.
The nice thing about this type of sitemap is that it can be read by humans AND search engines."
What does "this type" mean? It couldn’t be the Google sitemap becuase you write
"The other, newer type of sitemap is the Google Sitemap. You use our Google Sitemap Generator (located at the bottom of this box) to create a file which you then upload to your web server. This is NOT for humans to read and you don’t link to it from any of your web pages. Instead, you log into Google Sitemaps and tell them where your file is located."
Are you talking about choosing Sitemap, Save Sitemap, XML file? If not when would one choose XML file? – to get better results in the main three search engines?
Thanks,
Roger

Hi Roger,
The universal sitemap is the HTML sitemap. This is a basic html / htm file that has a listing of all your webpages unless your site is very large, in which case it has a listing of all your main pages (that lead to other pages).
The latest is the XML sitemap, but not all search engines can read this yet.
Google sitemaps are made only for google.
So, yes, I am referring to the Sitemap, Save Sitemap, XML file.
Regards,
Jim.