Overnight I had a bunch of search engine hits about the beheading of Nick Berg in Iraq. Presumably people are looking for the video of the event. Yes, I have seen it; yes, I believe such things should be made public; yes, it is ghastly and horrifying. I got the video from Ogrish.com (warning: if you haven't seen this site before, it is neither safe for work nor for those who are in any way squeamish).
Also, Oliver Willis linked another blog that was hosting the video (as of yesterday, at least).
If you do watch this, remember: that's a real human being there, and he's been murdered by other real human beings. This isn't an outtake from 24.