Not sure if this has been discussed, or just a coincidence but,...
I'm seeing quite a few sites with good PR on all pages except their links page. These pages had PR before, now they are either PR0, or grey ( not indexed ).
It seems it's more consistent at sites that have just one links page with multiple topics on it, sites with multiple links pages (directory style links pages) on topic seem OK.
the consitencies I see are:
Most have link text pointing to them called links
Most are called links.htm or have links in the URL.
Most are 1 page, multi-topic links pages, e.g., there is no targeted theme to the page, anything from greeting cards to health sites all on same page.
Could these be mistaken for FFA's?
I haven't checked fully, but many are listed on "link trading" sites. Maybe peple have created link farms and don't realize it?
I've seen this on many sites. It doesn't seem like a coincidence.