I love the idea of Wikis–there’s something appealling subversive yet democratic about them. However, I am skeptical of the long-term viability of open-access Wikis because I believe they are inevitably overtaken by the spammers (among other defects).
I got a quasi-spam promoting Wiki-Law, which says its “goal is to build the largest open-content legal resource in the world.” This struck me as an exceptionally bad idea. Wikipedia content is generally untrustworthy–a fact that Wikipedia’s founder Jimbo Wales generally admits–but untrustworthy/not credible information about legal topics has zero upside and tons of downside. There may be some situations, like legal information, where no information is far better than wrong information.