Thanks EGOL. It is good to have an example of the accordion technique hurting traffic. This is becoming so common I'm surprised there isn't more out about it. Interestingly, Google itself uses hidden text extensively in its Chromebook site, look at the content behind the tiles further down on the How It's Different page. And I frequently see
applied to images as is done on the carousel for Isite design. Is it just that they are counting on other factors?
I'd sure like to see an exhaustive study on this. (SEOmoz, this is your cue to jump in with data already out there or to take this research on!)