I know this topic has been done to death but it still blows my mind that most of those papers are not freely available. It would be nice if the freely available ones were marked as such in the list.
Don't get be wrong, closed publications are a travesty. But they are a travesty because institutions pay out of government grant money (indirectly via overhead) to pay for subscriptions and because it's government funded research. They are not, at least in anything approaching the average case, a travesty because researchers cannot access results.
edit: Ah, I just noticed some searches have a direct link to the PDF next to the main search result "[PDF] from domain".
It's not "freely" available but it's not something that everyone has to pay publishers directly for.