Textorizer is a little web service that will take any image you give it and turn it into an SVG image made out of the text you supply. It's pretty cool and the edge-detection works pretty well, though obviously it works better with images having solid edges like logos and illustrations. Unfortunately missing is a way to change the font or text size, and a way to save the output as a (rasterized image), but it's definitely fun. To use Textorizer you'll need an SVG-capable browser.