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Ever come back from the shops, totalled up your receipts (the ones you can find AND read) and been aghast at how much you've spent? Those "little" purchases that have somehow added up to half your salary?
My idea is for the wireless wallet, that when opened with a pin code displays the current amounts in your bank account / credit card account. When you make a transaction (eg : with a Switch card), press UPDATE and it will log into your accounts using pre-entered data and download the latest TOTAL. It can also have a field for that day's total, so you can see as you spend.
Never be caught out with your shopping total again! It will also save you the hassle of going to a cashpoint machine just to check your balance.