Polishing, removing light scratches....

only thing i can thing of its to wet sand it a bit or mabey an abrasive polish, outside of that, I don't see how anything else would work, since unlike a car, these computers don't have a clear coat you can just "wear even"

 

I would start with iKlear which Apple uses on their display computers. Otherwise, I would try to go into a store and ask an employee. Do you really want to screw up and have swirl marks on your brand new MBP?

 

What about that mr magic erazor stuff or applesauce polish ?

 

I'm not sure if its possible to buff out scratches on the the aluminum. As stated before, it doesn't have a smooth finish like a car. You can try to sand it out, but it would be difficult to get a matching even finish as the rest of the body. Any polish would just make that spot shiny - which wouldn't be what you're looking for.