Bell Centennial is very good at small sizes as it was designed for that.
I have designed a board game and hope to publish within the next year or two. One of the major components is cards. The cards are small (3.5 x 2.5) and play a large role in the experience. They contain images with some accompanying text outlining very important game info. The text is small 5pt being the smallest sometimes reversed out of color other times in small boxes. I hope to use only two typefaces and organize all the info using weight variations, colors and boxes. The feel of the game I hope to obtain is one of high-tech/sci-fi/adventure/superhero. Though beta testers have fun playing the game, it is a game of very involved strategy and can get quite complex and intricate, thus the target audience would not be children but the 15-30 crowd. I hope to balance a friendly look with a serious high-tech look.
So far, as a crutch I've used Eurostile and Bank Gothic. Bank being used for titles and Euro for the rest.
Any suggestions will be appreciated. Thank you greatly!