Maybe Blekko provides a filter, since they scrape Adsense publisher IDs. While we're back on that topic, anyone here have any new insights into how to prevent further publisher-ID scraping by Blekko and others?
I've looked into HTML encoding (which might be self-defeating IF the search engines won't crawl your encoded HTML) as well as 3rd-party ad serving. Technically, neither violates G's TOS, but as far as I know Google is not addressing either issue specifically. (Maybe this is an issue for a new thread.)