WordPress.org

There are no comments yet (or I've disabled them) and all my postings have a priority of zero!

Please disable automatic priority calculation and define a static priority for posts.

Do I always have to click on "Rebuild Sitemap" if I modified a post?

No, if you edit/publish/delete a post, your sitemap is automatcally regenerated

So much configuration options... Do I need to change them?

No, only if you want to. Default values should be ok!

Does this plugin work with all WordPress versions?

This version works with WordPress 2.1 and better. If you're using an older version, plese check the Google Sitemaps Plugin Homepage for the legacy releases. There is a working release for every WordPress version since 1.5

I get an fopen and / or permission denied error or my sitemap files could not be written

If you get permission errors, make sure that the script has the right to overwrite the sitemap.xml and sitemap.xml.gz files. Try to create the sitemap.xml resp. sitemap.xml.gz at manually and upload them with a ftp program and set the rights with CHMOD to 666 (or 777 if 666 still doesn't work). Then restart sitemap generation on the administration page. A good tutorial for changing file permissions can be found on the WordPress Codex and at stadtaus.com.