Copyright Without End, Amen
Professor Lawrence Lessig's Wiki is discussed in this Chronicle of Higher Education article:
"Update: It's no surprise that Lawrence Lessig, the Stanford University law professor and copyright guru, finds Mr. Helprin's argument less than convincing. Mr. Lessig has set up a wiki-style rebuttal to the New York Times opinion piece, and people have already flocked to the site to poke holes in Mr. Helprin's thesis. One particularly cogent point: 'Physical property, such as real estate, is a finite resource that operates as a zero sum game. And the laws regarding physical property treat it as such. Intellectual works are abstract concepts and do not naturally operate as zero sum games.'"