Another thought on science communication - science is already a wiki if you look at it a certain way. It's just a really, really inefficient one - the incremental edits are made in papers instead of wikispace, and significant effort is expended to recapitulate the existing knowledge in a paper in order to support the one-to-three new assertions made in any one paper. And the papers are written in a highly specialized form of text that demonstrates the expertise of the writer in the relevant domain, but can form a language barrier to scientists outside the domain understanding the key facts.