At it's core use, it's to filter the article page comments that appear outside of the forum. It's to give casual readers a sampling from the forums without having to delve into 30-40 pages.
Later on, it may (or may not) have more usage as we integrate it more.
arn
Wait, my pipe theory was actually (somewhat) flowing in the right direction???
Any chance the additional (possible) features can be incorporated in the user-forum level, or given a filter subset within forum search?
Also, prior to your answer here, I was betting the down button removal itself was an experiment / test in itself.