Just to clarify, I don't care about "PR leak", "hide the links", just HIDE some of the text.
My pages have 5-25kbytes of text in greek and a couple of lines of ads in english, yet the snippets show the english text...
I meant do customised content delivery per user-agent (if it's googlebot or slurp, strip off the ads), or check for both UA+IP.
Google comes with different UAs from time to time, we all know that (I notice it in my logs). I don't want to do UA+IP, because it'd seem as if I wanted to hide something "suspicious", which I'm not. Just UA. Which on the other hand, could be interpreted as sloppy cloaking attempt.
What a mess!