Adam has touched on this, but here's a bit more Nazi analogies: If the Internet has brought us anything, it's the opportunity to contemplate the nature of Nazi analogies at length. But yesterday's argument about it is actually instructive.
Andrew Sullivanpoints us to a paper demonstrating that until the American government started doing it, waterboarding was almost always referred to as "torture" in elite American newspapers, but in the time since, it is almost never referred to as "torture" -- for example, from the 1930s to 2003, TheNew York Times referred to it as "torture" on 44 of 54 occasions, or 81.5 percent; but between 2004 and 2008, they referred to it as "torture" in only 2 of 143 articles, or 1.4 percent. This shouldn't be all that surprising if you've been paying attention, but it does highlight something important about our media.
One of the ways we criticize people on the other side is to say they aren't "serious" about some policy matter, or about policy in general. Even though I've used it myself, it's a problematic thing to say, because what it essentially says is, "There is no need to listen to anything this person says." People who thought it was a bad idea to invade Iraq were derided for lacking seriousness about foreign affairs, for instance, a claim usually made by those who turned out to be spectacularly, embarrassingly wrong about the thing they were claiming such seriousness about.