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Reno - 2:00 am on Jan 7, 2011 (gmt 0)
Refreshing a url manually or automatically just to look "fresh" is a kind of trick and Google hates tricks.
Print out the quote below, tape it to your monitor ~ it sums up in a nutshell everything about SEO that you'll ever need to know:
You're much better off to spend energy building content that is valuable to your visitors, making sure your site doesn't generate duplicate URLs and has a link structure that serves people well.