Forum Moderators: open
Today, I learned that's not the case. My front page changes daily, but in the course of a week, there are very few things that still appear on it that were there the week before. I saw a hit in my logs today for a movie that was new back at the beginning of August and I panicked - "My Fresh Tag's Gone and I'm back to my early August version!"
But, by typing something that my page should be high ranked on THIS week, I discovered that my "freshed page" was still there. I was able to duplicate this by selecting obscure words from my "older" version and some obscure words in my "newer" version (two days old). Each time, the results came up with the cache showing the proper version.
So, I don't know if anyone else cares, but if you DO change your page a lot, don't worry too much about moving something that got into the crawl if you think you might get freshed - that crawled page is still in the index, it just doesn't appear unless that version of your page is relevant.
G.