The Card Color Titles for Trello is a must-have Chrome extension if you use Trello at all.
The labels that you add to cards show up as little colour bars by default and I’ll be damned if I can remember what all the colours mean.
But the extension simply adds the name of the label to it, so you don’t have to remember. I don’t really understand why it’s not the Trello default:
The only problem is that you’ll wonder what’s gone wrong with Trello when you view it on a machine without the extension!