Picked up another interesting bit from Plastic yesterday: there’s an “ad-busting” site called All Your Brand Are Belong to US. Their mission is to “pre-emptively hijack strong memes for heightened media existence.”
Update: Looks like this site is gone, but this site was inspired by it.
Update 2: The second site is now gone, but I found both it and the original in archive.org and updated the links.