I'm trying to give a better reason for guests to register on my forum. It has guides, tutorials, etc.
I believe that hiding just a few key contents (such as images, videos and links) would be enough to make them register on the forums to see the full content.
Some plugin that would block the BBCode content and say: "You cannot view this content because you are not registered."
(Leaving a message is not the most important thing tho, I already have a message plugin that tells what are the disvantages of being just a guest).
I found a plugin that would might work for me: @Plunts "Hide Hack", but it doesn't have a WBB 4.0 version...