Intelforums has a review and comparison of Artic Silver's Ceramique thermal grease:
"We were very impressed with Arctic Silver's Ceramique overall. It is defiantly an improvement over previous Artic Silver offerings in that it offers slightly improved thermal conduction, and is non-conductive, meaning a lessened risk of shorting your processor (esp. an Athlon processor). As with previous Arctic Silver TIM offerings, it is heads and shoulders over the competition, once again showing us that they are the market leader in this field."