“Religious freedom means not only freedom to practice your religion,
but also freedom from being forced to practice someone else's.”
I went to a news site, and this message popped up in a little window of its own:
"Window videoAdPlayer is already registered in the DOM! Make sure you use setDestroyOnClose() or destroyOnClose: true in the constructor "Now just what the hell does that mean? I hope it wasn't really meant for me, because if so, I don't have the faintest idea what it wants me to do. And I sure hope somebody, somewhere, closed something....
Later edit, 9/20/09: A lot of people must be seeing this message, because a lot of people are ending up here through Google searches, so I'll pass on some additional information. I can't say for sure that the above message had anything to do with it, but within minutes of seeing it, my scanners and sniffers freaked out, reporting the presence of a trojan involving "VUNDO.gen.bp" (see http://en.wikipedia.org/wiki/Vundo, very scary), "lovojefu", and "mozulavo". Because my faithful protectors prevented updates to the registry, the trojan was fairly easy to remove/disable.
If you saw the above message, you might want to scan your system, or restore from backup.
6/8/10 Edit: As you can see from the comments, people are getting this message now when they visit Salon.com. This time it appears to be innocent. The appearance of the message may or may not signal an attack; it may be just a bug in the code (probably Java). But keep in mind that any time an error message appears it's an indicator of sloppy code and inadequate testing, which is more likely to turn up in a trojan or virus. Don't be lulled into complacency. Scan just to be safe.