  1. save smartblend-hugin.bat to the same folder as smartblend.
  2. Start Hugin.
  3. Open File -> preferences.
  4. Switch to Enblend tab.
  5. Check "Use alternative Enblend program".
  6. Choose "smartblend-hugin.bat" as the executable (use the full
path).
  7. Press OK to save the settings.
  8. On the Stitcher tab in Hugin, click the Options button next to
the Remapper and make sure "Save cropped images" is unchecked.
  9. Enjoy SmartBlend!

Reference
http://groups.google.com/group/hugin-ptx/t/b11d91ad0280ace0