Oyster cards are, reluctant as we may be to admit it, a massive improvement on queuing at machines for hours only to find that they want the exact change, which of course you never have. Once you've got an Oyster card, you're kind of wedded to it, but it's definitely a pain fishing it out the whole time, and why didn't they think of printing a tube map on the thing - surely that would have been a sensible idea? Luckily this rather slick matt PVC Oyster Card wallet comes with the Tube Map handily printed on it, so when (inevitably) the Jubilee line's down and you have to find another more tortuous route home, you can do so on the move - and not have to cluster round a wall map looking embarrassingly like a tourist.
Gadgets & Gizmos - I Want One Of Those