GetSimple version 3.1 generates a sitemap.xml file in the root of the site, even if you have disabled pinging to search engines.
If you want no sitemap.xml file, you can use this plugin: it deletes the file just after it has been generated.
Download Remove sitemap 0.1 (Extend)
Installation: Uncompress fle and copy/upload the removesitemap.php file to your plugins folder.
(GetSimple forum support thread)
0.1 initial release
0.2 does not ping search engines even if GSDONOTPING is not defined in gsconfig.php