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I'd like to know if anyone has any experience where the Sitemaps helped or hurt their site. I know Matt Cutts has specifically said he has spoken with the sitemap team, and it "should" *not* hurt your site to submit a sitemap, but as many people put it... "after submitting a sitemap, the next day, my house burned down".
So, I know Google Sitemaps is designed to help Google find all of your pages, and for a good site with good inter linking it should be un necessary, but for a forum site for example, I think it's a good idea.
What are your thoughts?
If you use webmaster tools without problems, I'm sure you'll be fine.
However, if there is a problem with your site, then it could be that waving a sitemap under Google's nose will draw attention to that - but if you are
(a) confident your site is OK or
(b) not 100% sure - but if there's a problem, you'd like to get it out in the open and sorted asap
... then go for it.