From Smashing Magazine comes this awesome listing of some of the best free vector packs available.
While the images are beautiful and many are suitable for cutting, few of them are in SVG format. Most are in EPS, PDF or AI format. Newer AI files, as well as PDFs will import directly into Inkscape. When you double click on an EPS file on a Macintosh, it will be converted to PDF automatically and open in Preview. From there all you have to do is save it and Inkscape will make it into an SVG.
Once you have imported an AI or PDF into Inkscape, click on the vector pack and begin ungrouping until you see dotted rectangles around each individual image. To work on an image, drag it off by itself or save it to a new document to do any necessary simplification, color separation or whatever. Once it has been saved in Inkscape you can then import it into SCAL for cutting.
Here’s an example, starting with one of the free vector packs from Designious.com
We open up the EPS version and save it as PDF in Preview, then open it in Inkscape and Ungroup
Then delete everything but the dolphin we were after and saved under a new name.