Really depends on the scratch. But, have you tried Apple? I use the Apple conditioner and the AppleGarde protectant for leather and suede. I get mine at Burlington Coat Factory...in the leather coat department. There are different formulas for different materials.
No, I havent tried anything yet. Not a big scratch, but I didn't want to do anything. I just got it so I am being a little paranoid....
I used LMB moisterizer that will blend in light scratches. I also use their cleaner.