It is worthless to pull information off the internet once it is there. A much better idea is to prevent it in the first place:
I’ve been following this story and went to the Matasano website shortly after the story was published. it wasn’t there for more than 30 min (perhaps a few hours) but the information was out. Even though they have removed it from their website, everyone knows. It is worthless to spend even 30 seconds searching your website(s) for information from the past to remove when something changes. Everyone already knows.