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And also: I have seen so many pages beeing thrown out of the Google cache/ index for the last two months or so. Anybody having the same experience?
I always thought that if a page isn't in the cache it also isn't in the index.
It doesn't work like that. You can even use the meta tag <META NAME="GOOGLEBOT" CONTENT="NOARCHIVE"> to ensure that there's no cache, and the page will still be in the Google index and ranked with no "prejudice". That's very useful for time-sensitive information that you don't want to hang around after a certain date - sale prices, for instance.