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Anyone have any thoughts
the hidden text, well now... don't be shy and do tell us the site.
One challenge Google faces is that such true hidden text is very hard to detect algorithmically in these days of CSS, DHTML, AJAX, etc. So Google relies on their army of human reviewers quite heavily in detecting true hidden text.
Another challenge comes with websites for major companies - the kind of website that searchers might 100% expect to find in the search results for a given word - sometimes even a generic word. I don't mean that Google doesn't penalize the big boys on occasion - but when they do, the company can get restored quite quickly after a fix. And sometimes they do seem to "let it slide", especially when the ranking is not really influenced by the hidden text [that's my guess].