Earlier quoted context omitted.
"You can't patent obvious shit" is actually patent law, so that's not a suggestion at all... it's just not enforced very well, is it, and that's the whole "mystery".
"Obvious" in US patent law basically means you assembled pieces of prior art like Lego bricks. If you use something nobody ever wrote down, it doesn't matter how many of your peers would have immediately realized the same solution (i.e., whether your disclosure actually benefits anyone), you win the race just by having encountered the problem first. http://en.wikipedia.org/wiki/Inventive_step_and_non-obviousn...
The fact that the decision was unanimous has a lot of us hopeful that the new patent cases that the supreme court is taking on will see more of the federal circuit's nonsense cut back. It won't be patent reform, but it will be progress.