You may not want to do it exactly like this, but here's one way that actually worked.
For this project, I used the image created in the document ConvertImageWithGimp - http://www.instructables.com/id/EJ6T5P8VDYEY95WJHN/
Here are the photos - http://flickr.com/photos/connors934/sets/72157594503018354/
There is also a process for taking the image created with gimp and cutting a stencil with the Roland Signcutter using the Fabuntu interface, which at this time has not yet been written.
This technique was developed in part through the guidance and advice of Ed Baafi and Amon Millner at the South End Technology Center Fab Lab.
There are a few advantages of using this technique. Having the image in the computer and 'printing' it with the vinyl cutter means that you don't have to get nervous about ruining your original artwork. You can also scale the image up or down. If you want to make a small print on one side and a big one on the other side, you can just cut it with a different size. You also don't permanently attach the stencil to the screen with this technique, so you can use the same screen over and over by keeping it clean after each use and peeling the stencil when you need a different image printed.
Step 1: Stretch the screen
Attach one side of the screen to the frame. Start in the middle with one staple, then stretch toward one end, staple it, then pull the other end, staple it. Get the middle locations, each time you put in a staple, it should be pretty much in the center of the gap. Sometimes it is good to put them parralel to the edge of the frame, then go back and put them at 45 degree angles. On the first side you don't need to put any tension on it while you are stapling, but on the next sides you do.
After you have one side completed, start in on the side opposite. Start with the center of the opposite side. Pull the screen very tight until you have the staple in the wood then let go after you staple. Next do the top corner and bottom corner. The next staples go into the center of the top and bottom gaps. When you have the side pretty much done, you can go back and put a diagonal one in the gaps. Tightness is important.
Next do either the top end or the bottom end. Same technique as above. When you are done, the screen should be uniformly tight and taught as a drum head.