Update: Andrea, in comments[JawaReport:
I don't believe for a second they removed them. Look at the incramental increases in the other two week timeframes. YouTube took them down - and then YouTube put them back up.
Quoting myself -
"I've about decided that the pressure that was put on Google at that time did actually result in their experimenting with some kind of word recognition software (like they obviously have for porn) and it worked. But, again, until such time as they must follow the law or pay the consequences, they just ain't gonna go there if it's going to cost them a dime no matter how many lives it saves."