In my experience, sitemaps aren't for URL discovery, but more for URL prioritization. Google will pretty much crawl you whole site whether or not you include a

In my experience, sitemaps aren't for URL discovery, but more for URL prioritization. Google will pretty much crawl you whole site whether or not you include a sitemap. Where the sitemap becomes important is whether google includes in the supplementary index or the main index. With a sitemap, you can specify a priority for each page and basically hint to google that some pages are more important than others. http://sitemaps.org/protocol.php#prioritydef http://sitemaps.org/protocol.php#prioritydef