johnnie - 9:39 am on Nov 30, 2009 (gmt 0)

I think it's dangerous to assume SEs simply ignore CSS. Think hidden text; I'm pretty darn sure google would quickly find out about your <div style="display:none;>Viagra viagra viagra etc.</div>. I don't see why SEs would not be able to parse the markup of a page much like a browser does, potentially adding some semantical weight to words in bold etc.