goodroi - 10:48 pm on Jan 6, 2011 (gmt 0)
google likes to see fresh content. knowing this, some seo people many years ago would regenerate their website every night. google is lot more sophisticated today. simply uploading the same pages with the same file size will not significantly help.
if you want to play this game, the current iteration deals with displaying the date on the page.
these tricks are generally just for short term benefits and imho not very big benefits.