I recently found a referral in my logs for Sonicwall, which amongst other things does content filtering. Curious, I decided to see what they had to say about my sites. They have this form where you can check: http://cfssupport.sonicwall.com/Support/web/eng/newui/viewRating.jsp Some of the time they got it right, but there was one glaring error where they had my website for writers classified as adult/mature content. They're obviously not taking these ratings from ODP directory classifications. It makes me wonder how many other content filters are getting it wrong, and how I can check. So if you know of any others that can be queried like this, please post them here.