Bitmap to vector

I found a nice page, where you can convert your bitmaps to vector graphics.
Take a look here.
Vectormagic can convert the following files:

Input: JPG, GIF, PNG, BMP, TIFF
Output: EPS, SVG, PNG

They have some very nice samples online.
Yes i know, there are some program you can buy to do this, but if you only use this feature rarely, than an online conversion is very helpful....