Found a link to a new online Bitmap Tracer: VectorMagic
They compare the results of their Bitmap Tracer with Adobe Live Tracer and Corel Power Trace (it seems, they don't know Xara Xtreme's Bitmap Tracer and Inkscape's Tracer...).
Currently the server is a little bit overloaded, but perhaps it's a nice service to use later.
Remi
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