We're solving this over at Gophr.it for the courier industries with planned, GPS tracked delivery where you have direct contact with the person bringing your parcel to your door - In London and eventually, the world. The delivery industry is the next space we want to move into once we build a solid foundation and we've got a big bullseye marked on the "No one home at X time" problem.
We're also hiring a graduate sales exec in London if anyone wants to help solve this issue with us! (Email in my profile)