Postal voting is a more popular voting innovation than e-voting, so it's no huge surprise to see VoteHere follow the money… Using technology they created for electronic voting they have announced a postal vote audit tracking product.
Not much use for this in the UK as we still have numbered ballots. But I like the idea of this product – it effectively allows anonymous tracking of the ballots, including for the voters if required so you can get FedEx type assurance of the vote's arrival for counting. This would certainly help boost confidence after this year's negative coverage in the leadup to the General Election.