VectorMagic | The Online Tool for Precision Bitmap to Vector Conversion

"This site converts bitmap images to vector art -- it's an online auto-tracer. Just upload your image and we will vectorize it for you. Vector art is useful because it allows you to scale an image without making it blurry or pixelated. Vectorization (aka tracing) is the process of converting a raster image to a vector image. Raster images are pixel-based, whereas vector images are represented by geometric shapes such as lines, circles and curves."