I run the site (just got a link in my email from somebody to this thread)..
I wanted to say I have no partiality to bf.c or ub.c .. I have backlog of articles and links I have to add into the system which will be added soon along with a few other updates on how the site operates internally.
As for whether I "link" to the site or copy the article, that depends on my options. If the article author allows me to copy the article, I prefer to. If not, I would just add a link (and keep the backup of the whole article on my hard drive just incase the linked site disappears someday)