you set your postal address to, say
123 Whatever St
then, for a few dollars a month Digipost will scan every piece of mail you get and send it to you by email.
their web site lets you access all your old mail digitally, suitably tagged and indexed, (maybe ocr'ed)
the web site also gives you a 'shred it' button which destroys the hard copy and a 'really send it to me', for when you get a new credit card, or your car rego sticker
the shred it button has some nice sound effect when you click it and maybe an animation.
there is some kind of eco friendly paper recycling done (at least the marketing claims this ;)
there is also an iphone app (of course).
this would be great if you wanted to travel and still be able to pay your rates bills.
of course you don't use your Digipost address for package deliveries or birthday cards from your grandma, only for bills and statements.
i think this would be pretty useful.