XML Sitemap URL Counter
The answer to "how many URLs are in our sitemaps?" without writing a script.
Someone asks you for a URL count. You open the sitemap index. It points to 47 child sitemaps. You briefly consider clicking through each one, then you don't. Paste the URL here — this fetches the index, follows every child sitemap, and gives you the number.
Works with both <urlset> sitemaps and <sitemapindex> files. Index files are followed automatically.