Double RAW technique

As promised a layer mask tute on how to combine two differently adjusted RAW files to create one wonderful shot!
I hope this tute displays OK at the resolution I have uploaded.. let me know if not!
I don't know how this exif data arrived on a PSD file as I haven't used the powershot for 2 years ????
Picture
Make: Canon
Model: Canon PowerShot S3 IS
Shutter Speed: 1/125 second
F Number: F/2.7
Focal Length: 6 mm
Date Picture Taken: May 3, 2008, 2:38:15 AM

Finished deviation at [link]