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incrediBILL - 5:49 pm on Jul 30, 2009 (gmt 0)
If you do that however, you will tick off people coming to your site via SERPs to direct pages.
If the only page you have this BUTTON on is the home page, it really doesn't stop the spiders, or the people, from bypassing your home page unless you're tracking access via sessions and kick new sessions back to the home page.