1.Vector magic is best vector illustration software includes a live trace tool that can quickly and accurately convert images and scan a image.
2.Able vector is an application (just for AUTOCAD users) and service (for everybody) that can be used to vectorise digital images, to vectorgraph (such as Macromedia Freehand, Adobe Illustrator or AutoCAD, CorelDraw, IronCAD, TigerCAD, etc.) in line style....
These two are powerful tools for vectorizing an image..