Thanks, Bryon, it works like a charm in PSP, too (posted one in the Artify 69 thread). Here are my directions as I've figured them out for PSP:
1. Open an image in PSP. 2. You need to make a selection that is squared. Use the selection tool, and choose Square as Selection Type. 3. Make a selection. 4. Go to Effects, Distortion, Polar Coordinates, and click the radio button "Polar to Rectangle". 5. Rotate the selection 180 degrees: Image, Rotate, Free Rotate, click radio button that says 180 degrees. 6. Now apply the same filter we did in point 4, but this time choose the upper radio button, labeled "Rectangular to Polar". 7. Crop your picture to get rid of the stuff surrounding your new Amazing circle.