TheMadScientist - 1:19 am on Jan 7, 2011 (gmt 0)
IMO Nope, no point at all to engaging in any of your ideas...
Check out this thread and the linked patent:
If you pay careful attention to the section on Freshness you might think it cascades much like PR and has nothing to do with the modified date of the page.
Pretty sure I've got the right patent, if not find the one covering freshness as a factor. IMO and from what I've read freshness is not determined the way most people think it would be, and freshness isn't always good.