Jonah Goldberg makes some enlightening observations on "freedom of speech" qua Iranian President Mahmoud Ahmadinejad and The Perfesser.
Excerpt:

When Cindy Sheehan was still a darling of establishment liberals, they defended her increasingly batty statements by saying, in the words of Fox News’ Juan Williams, “she’s an American, she has the right to her opinion.” Absolutely, and I have the right to my opinions, too. But somehow I’m anti-free speech when I voice them.

This whole line of argumentation is a sign of intellectual weakness or cowardice. Take, for example, that mossy cliché “I may disagree with what you have to say, but I’ll defend to the death your right to say it!”

The only reasonable response is, “Who gives a rat’s patoot?” If I deny the reality of the Holocaust, or insist that “2 plus 2 equals a duck,” or that I can make ten-minute brownies in six minutes, responding that you may disagree with what I say but will defend my right to say it is a shabby way to sound courageous while actually taking a spineless dive. How brave of you to defend me from a threat that doesn’t exist while lamely avoiding actually challenging my statements.

Similarly, there’s been a lot of high-minded gasbaggery over this elusive idea of “academic freedom.” A more selectively invoked standard is hard to come by. Somehow, when former Harvard President Larry Summers, one of America’s most esteemed economists, told a group of academics that the distribution of high-level cognitive abilities may not be evenly spread out among men and women, activist feminist professors got the vapors and claimed, from the comfort of their fainting couches, that their hysteria could only be cured by Summers’ head on a platter. But Ward Churchill, a penny-ante buffoon who seems to have downloaded his Ph.D. from cheapdegrees.com, compares the victims of 9/11 to Holocaust planner Adolf Eichmann, and suddenly academic freedom demands Churchill keep his tenured job forever, at taxpayers’ expense.