I have, perhaps foolishly, gotten into a LinkedIn (group) debate regarding the value of submitting an XML Sitemap to Google. My contention is that if you have a reasonably well developed site with good navigation, then submitting a sitemap to speed up the indexing process will be of little value. After all, we all know (don't we) that Google does what Google does and attempting to control its indexing behavior is time poorly spent.
Paraphrased kind of from the opposition, "Submitting a sitemap to Google should be step one in launching a new website, and should be in the top 5 maintenance tasks as time goes on. A properly prepared, submitted, and maintained sight map can do wonders for your SEO efforts."
Fact or Fiction or not enough data?