You'll going to like this one than - The Shady Science of Ghost Hunting
It's pretty long. I read the whole thing and I agree with the guy, but I agree even more with Howard765 who posted a comment about that article!
There are documented strange events that scientists didn't manage to explain.
I think that it's not up to ghost believers to prove that ghosts exist, but it's up scientists to give plausible scientific explanations of some "ghost encounters" and prove that it had nothing to do with "supernatural" (I don't like that word btw, because like I said at Impervious's thread about paranormal - nothing happens in contradiction with nature, but in contradiction with what we know about nature). This makes more sense, because IF ghosts do exist, we know nothing about their nature and what instruments we can use to detect them. So... scientists, skeptics should go and debunk every and each ghost encounter. Those that remain unexplained they could tag, for the sake of their reputation , as inconclusive...