Yup. He's left handed, alright. Another media fabrication.
George W. Bush's Handwriting Sample
Source: Here, credit LGF (little green footballs)
"Original" Reuters pic:
It's starting to look like CONDI wrote the top half of the note and President Bush wrote the bottom half. Of course, I'm still stuck on that right hand/left hand thing. I don't know if that's accurate. I've found pics of him using both hands - something else the libs will point to as EEEEEVIL!!!! ;)