I think most of these people have it wrong though. Do we really think that Google is worried about hidden text in this day and age? There are so many legitimate ways and reasons to place text on a page that the users do not see when it first loads. Just look at Yahoo’s homepage and use of CSS on-page tabbed browsing. I believe the only on-page spam techniques they really care about are auto generated content, cloaking, and redirects. Hidden text is just no longer a factor in Google’s SERPs.