Virgin's Advanced Network Error Search

In a semi hungover state, I tried browsing over to Facebook but accidentally entered www.face. Instead of receiving the traditional address not found error page, I got the following;

Contrary to the rumours this is not a modification to your machine or browser but instead the way in which Virgin are handling DNS requests for addresses that are not found (NXDOMAIN). I've not decided whether it's good or bad at the moment but would rather it be an Opt-In service rather than Opt-Out. El-Reg covered this back in August and there's a lengthly discussion on cable forum regarding this - link