Garmin (GRMN) is being added to the S&P 500 as of the Dec. 11 close. The PND maker will be kicking out R.R. Donnelley (RRD), which is joining the S&P MidCap 400. RRD has had a tough year, punctuated by declining demand for printing services and an embarrassing mishap related to Google's Q3 report. GRMN +4.5% AH. RRD -0.7%.