"Okay, is the light red or green?"

Many years ago, I was working setup at a trade show, and the network guy asked me to run down to the other end of the conference hall and check out a piece of equipment for him. When I got there, he called me on the radio and asked me what color the blinkenlights were.

“Oh, you didn’t know I’m partially color-blind.”

Today, Dan Kaminsky has released a new iPhone/Android app that does real-time color filtering to allow you to compensate for these problems. I don’t have any compatible devices at the moment, but they seem to have matured enough that it will be worth buying one soon, and this will be a must-buy app.