The website www.biblecentre.net has kind of been flashed around in a number of different Biblical websites. It operates under the premise that by making books available online, they're doing nothing different than a library does with having a reference shelf open to users. With that as their premise they offer a lot of Biblical resources.
Because what they're doing with materials in copyright is highly questionable and very likely illegal (maybe forever, or perhaps only until the Google lawsuits help explain digital rules on this stuff), I can't imagine the website being up forever. That being said, there is also available on it a number of resources which are NOT in copyright. You can go through there and see the list yourself. I was thinking specifically like the Trench books on the Miracles or Parables or even Synonyms.
Because these are not in copyright, it is okay to reproduce them. These would be helpful references for people.
once again. materials that are in copyright still (look it up on amazon to see when it was published if you're in doubt), should not be copied, but the old stuff, I think would be good to have.