Forum Moderators: Robert Charlton & goodroi
If you have fair amounts of topical content, that need to be retrievable in results as quickly as possible, then I think there's an argument for sitemap use. And of course, they're required for Google News and the like.
As for removing sitemaps, from memory there were various reports of problems occurring after removing sitemaps, but that was some time ago, and I believe Google said that those problems were fixed.
You can test to see if you need the sitemap anymore by NOT updating your sitemap when you add a new page to the site and seeing how long it takes Google to get a hold of it. Currently Google is getting my changes/additions in generally under 24 hours - there is no need for a sitemap.
But a sitemap should not, and as far as I'm aware DOES NOT, affect ranking in any way.
Be very aware of co-incidences. I just made a huge change to some meta tags across one of my sites and the following day traffic doubled to that site. If I were a newbie webmaster I would probably have come running to this board and posted that "Changing X meta tag can double your traffic!" - when the truth is that it is probably just a co-incidence that there was a ranking update for my site the day after I made the changes and the traffic change would have occured anyway.
we don't use them, but then we get spidered quickly, and have a clear hierarchy anyway.
Even Google's webmaster tools section talks about long URls and flash/javascript navigation as being good reasons to use upload a sitemap. It seems to have turned into some sort of worry for webmasters ... like filing your tax returns ... (though I'm willing to bet more webmasters upload sitemaps than file tax returns)