If we see a good article in a magazine that we wanna share, I think it would be good to mention it on the forums and quote no more than a paragraph or two.
Copying the full article could get me into trouble with the publisher, so I ask that you not do that.
Quoting a bit and saying "it was great!" usually makes the publisher think that we're a really cool community.
For other stuff on the net, embedding one pic and quoting a paragraph or two, along with making a link to where it came from is okay - and most of those folks appreciate the traffic that comes looking for the rest of the stuff. Copying the whole thing and not mentioning the source can get me into trouble.
Some people want to say "share the surplus" - and that can usually be done within the comfort zone of the people that created the original content. Doing anything other than what is within the comfort zone of the creator is outside of my comfort zone. And, I think, we can get all non-free permaculture information into the hands of everybody in a legal and free way (libraries are the first thing that comes to mind).
I want to encourage everybody to share, and spread the word of permaculture. And help encourage those that make excellent content make more excellent stuff!