Karoo, which is part of the K-Com group has started to redirect mistyped URL's that it's customers type in to send them to a page on Ask.com where they will then see a sponsored search result that K-Com will then receive part of the revenues made form this advertising.
Karoo are obviously pushing this as a useful service and are giving customers the chance to opt-out if they do not like it, although surely the service should have been opt-in instead? The trial started on the 17th March.