Do you think a search engine would care on this.
Every single page on my websites are updated multiple times a day, you could hit refresh and get at least some minor, real content, change every 15 seconds, all day long probably.
I kind of started feeling like the search engines thought of my pages as stale, as in no way show that they are dynamic, and some of these pages where built two years ago (though they have been changed from top to bottom a few times in that time, the fact is that the page itself was created two years ago, and by checking file date you would see a 2002 date if not earlier on some of them.
I really do not like forcing no cache, and all that jazz on a user, as to many are still on dial up. So I went in and wrote a fairly short script, threw a few thousand IPs of search engines at it, along with with their browser identifications, and now I just tell a search engine, google, yahoo, etc, that my pages has a new date, but I do not tell this to a human.
So, I am deliberitly trying to show one thing to the search engine and another to people for the purpose of improving rankings.
I think on the surface I fail every test one could think of on if it should be done or not. But in the end I can not help but think, why would they care?