Thanks, skiguide, it was the dominance of the paid listings that got my attention. It seems like everyone has sponsored links these days, but some portals are kind enough to not let the paid links push the free resources onto another page. That was in an education topic. A product category I looked at appeared to be pushing products through some kind of affiliate deal. It seems like all of these things take away from editorial impartiality, which I thought was the original concept of miningco/about - an "expert" guide to help others learn about a topic.