slvrstang, the backplate will help keep the memory cool due to the extended surface, however it's not very good at dissipating heat. But it's still better than keeping the chips naked!
Nvidia fan boy, TweakMonster specializes in ramsinks (all though they do make other minor modification hardware). The ramsinks are compatible with the standard one inch chips, as well as the new BGA chips found on the latest video cards.