Character profiles on 3x5 cards

I have an old library card catalog cabinet that I had moved into the basement when I was putting the office down there. I am going to be moving it back upstairs later tonight and setting it up in the corner of the office so that I can create 3x5 cards for all of my characters in my stories. This way I can track things that tend to change, such as Marcus having green eyes in one chapter and brown in another. ::pounds head on desk:: Hate it when I read back through chapters and find things like that. I guess it's better than one day getting a letter from a reader pointing it out, huh?