Daniel, I just use a blog or forum to capture notes in a linear fashion, and then can cull through it later to pick out the important ideas. It's that linear mode vs tree mode that is frustrating to deal with if the goal is to create a monograph.

And as far as getting people interested in reading new ideas, the Wiki tree mode does not help at all because the content is immediately buried in a possibly deep nesting. It would be interesting if a wiki could be automatically created from blog posts -- in a sense it can be, via judicious use of hash tags and embedded links.