Sorry, I should have been more clear - labeling components, similar to the silk-screening that you see on production boards. It would be nice to find a clear peel-and-stick sheet that you can print on and then stick onto the board, but that would mean that I have to drill through it. I have also seen some iron-on transfer stuff but it all looks like it is to put the circuit layout on the copper surface of the board. Don't know how it would work on the component side...