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Shaddows - 10:05 am on Oct 27, 2008 (gmt 0)
As Marcia says, its a semantic markup, telling the READER what the page is about. Now, google also uses <H1> as a signal because of what it's SEMANTIC conotations. To ignore the pupose of <H1> (semantic markup) and use it as a Google signal only is completely missing the point- and may upset google as deliberate manipulation detracting from clarity for the user. Write your page for the user, with an eye to what google rates. Do not write for google, ignoring what the user wants.
<h1> should introduce the page / document.