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Jay, I think that there are times when google attempts to filter out certain types of spam, and some link sites might also be hit. The nature of a link site is link link link... a pattern that is often caught up in the spam filters whent he write them.
There has also been talk on various boards and blogs about google attempting to filter out the PPC search pages put up on expired domains, as well as the people who rip off listings from dmoz or google itself and use them to populate spam pages. Again, the nature of those beasts is link link link, which might be what got filtered.
Google's 100% reliance on algo instead of eyes means that adult link sites and TGPs often get squished in passing.
Alex
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