I rather liked this one, as you can see how your browser is going to display your code. I was suprised to find that Netscape doesn't do inline frames. ;)
I got this to work a couple of times, and it was nice to compare new and old images side by side, but it wigged out on the third attempt. Don't know if it was a limit, but you might like to try it.
I know, technically, that it isn't good sense to use embedded fonts on a webpage; however you can use the fonts to make transparent gifs to accomplish a similar thing.