CPU/RAM 36C/96.8F
LAN/Ethernet 40.9C/105.6F
Big voltage reg by large capacitor 38.3C/100.9F
SDHC card 40.8C/105.3F at connector end, 25.6C/77.3F at other end

SDHC card is a "SiliconPower" 8GB, Class 4 device sourced from 7DayShop (cheapest they had!)
PSU is the one sold by RS. 5v@1.2A.
Ambient temperature of the board before initial power-on was 21C.
Do the problematic Raspberry Pis exhibit different temperature profiles?