I just got my SP3 last week, but here's what I did to solve the smudges issue.
I went out and bought a pair of microfiber cleaning gloves. The product name is Clean Green Microfiber Gloves. They're made to dust furniture and clean window blinds. Cost me about $6 for a pair at OfficeMax, and they are reversible so you can have a spare if you only want to wear it on one hand. I cut the ends off the thumb, index and middle finger with a pair of scissors.
Now I can draw to my heart's content without messing up the screen or having my hand stick to the glass. Added bonus is they're non-capacitive, so I no longer have problems setting off the Windows button either.