Google Sitemaps Myths and Fictions

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From reading the boards and feedback to this tutorial, we'd like to add a few items to Google's facts and fiction listing:

Fiction: Assigning a high priority in a Google SiteMap increases the URL's PageRank™.
Fact:    PageRank™ calculations have nothing to do with sitemap priority. It simply means, that possibly Googlebot will crawl high-priority URLs before low-priority pages.

Fiction: According to Google's TOS, commercial sites cannot participate in the sitemap program.
Fact:    Every web site can submit sitemaps to Google. You don't need a Google account to participate. Even webmasters of commercial sites may use their Google accounts to track sitemap downloads.

Fiction: Participating web sites must have Phyton 2.2 installed on their webservers.
Fact:    Only Google's free sitemap generator requires Phyton. You can use everyting you have to create and submit the sitemaps. Even notepad and a web browser will do the job, the sitemap protocol is that simple.

Fiction: Google penalizes web sites for frequent submissions.
Fact: There are no such penalties. Google encourages sitemap submissions on content changes. However, if your content changes every minute, you should go for a reasonable submission frequency.