I know that more than a handful of people have already created mini character sheets, but I thought I would go ahead and post the one I created for my games.
This character sheet is small enough to fit on a 6x4 index card. It has interactive fields you can use if you have Adobe Reader or Acrobat Pro (you can save data typed into the fields only with Acrobat Pro).
If you are printing on 6x4 cards, print at 100%. If you can get any use out of these, have at it. :)