Nintendo of America has launched its Nintendo 3DS
Ambassador Program Compatibility Tool, just in case you want to make double sure that you're included in the wait for 20 free NES and GBA downloads from the eShop before the year's end. The site reads:"To verify that you are eligible for the Nintendo 3DS Ambassador program, enter the serial number in the box below. The serial number for a Nintendo 3DS is located on the bottom of the system - just below the barcode - and starts with the letters CW followed by 9 digits. (Be sure to include the last number in the box.)"
Check your eligibility here.