I notice that on any page of mine where the content changes regularly that I get a new cache about every day. On other pages where the content is static, it doesn't get crawled or cached as frequently.
So, lets say I have a list of 20 products on a page and I don't care what order they are displayed in. Would I gain any benefit of crawl/cache frequency by simply having the products ordered randomly on each page load? Would google still see the page as unchanged or would they view the content as changed and worthy of frequent crawling and caches. Is there a downside to giving google content arranged differently every time it crawls?
I know it probably won't help rankings, but if it increases crawl/cache frequency at least I know that when I make a meaningful change to the page that google is going to find it quick... rather than a month later.
Might work, but I can't say for sure. Google's crawl team has their own rules for crawl frequency and they're not public. I personally wouldn't bother with this avenue for the sites I work with. If a page is only getting spidered once a month, I would look for more direct ways of improving the profile of the page and/or site with Google.