Card numbers on back of card.

[Cyborg572]

To see a card number when looking at the details of a card, you have to either close the card and find it in it's list, or open the "Share and more" popup. It would be great if the number where just visible somewhere.

[mikespokefire]

On the card list this is really easy to do as the card number is already present. Trello just hide it by default.

I've not found a place on the detail of a card that the number appears for easy display. I'm happy to accept a pull request that adds this behaviour though :-)