Block This: An Ad-Blocker for Android Without Requiring Root

Recently I discovered Block This in my long search for an ad-blocker for Android worth the name. There are of course several products around, first and foremost perhaps the venerable AdblockPlus, but they all have the problem that they require root access, i.e. the phone to be rooted. I have no intention of doing this as I simply can't be bothered enough to mess around with a smart phone and security-wise it's a much better idea to keep it locked down. If you don't know what I'm talking about don't worry, you don't need to.