Live Trace in Illustrator

live trace a scanned image or other image file into a vector image w/ illustrator.

Open a New document.  go to -File-Place- then navigate to the graphic to be traced, and that will become a vector.

2. Select the image, go to -Object-Live Trace-Tracing Options-.

Select -Trace- in the top right corner of the -Tracing Options- window, and dont forget to EXPAND the image after Trace.

And....presto-changeo, your graphic is now vectorised, and can be scaled without loosing quality.

http://www.webdesign.org/web/vector-graphics/adobe-illustrator/live-trace-in-illustrator.14292.html