The Domain Purity Test -- "This hack runs a search for the URLs in your domain and assembles the results (or the first fifty URLs, whichever comes first) into an array. It then searches for each of the URLs in the array with the SafeSearch filter turned ON. If an URL doesn't appear with the SafeSearch filter turned on, it's booted into the "Naughty" array. If it does appear, it's put into the "Good" array."