Google has a Terms of Service page and pretty much tell you what's kosher and what's not. My thoughts are that right now you can get away with just about anything and Google won't care but someday they might start caring about search engines again and woe to those who don't adher to the rules before Google finds out. The other major search engines have similar rules and similar attitudes. Personally, I think it's better to be safe than sorry sometime in the possibly near future.
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