jrychter shared this Bus Pirate reference card he made in the forum:

The Bus Pirate from Dangerous Prototypes is a really useful tool. I use it regularly to bring up and test new I2C devices, or as a cheap protocol analyzer for I2C and SPI.
Unfortunately, the supplied cables aren’t clearly labeled (only color-coded), and I found the reference cards available on the net lacking: they were usually not clearly readable and didn’t help much. So I created my own.

Thanks for the tip!

See also ecronin’s case sticker, and the new pin reference card category. We’ll keep openly-licensed reference cards in the documents folder of the SVN, feel free to contribute yours.