Beth Noveck is prolific re all things wiki. When it comes to using wikis for regulation, I would suggest reading Noveck's article on e-rulemaking - "The Electronic Revolution in Rulemaking," 53 EMORY L. J. 1 (2004). In terms of turning this into a practical, real world model, Noveck has spearheaded a number of software projects related to policy collaboration. Noveck, who runs the Institute for Information Law & Policy here at New York Law School, works with students, faculty members and others on solution-oriented, collaborative projects. These projects are housed at the Institute's "Do tank" - http://dotank.nyls.edu/. Of particular interest here would be the "policy wiki" and "policy evolver".