Infra-red stations can heat up only desired portion of PCB, while effectively cooling other areas by means of decompressing air.

Still, i think that replacing RAM in N900 is next to impossible and If someone want real open source N0, doing so like Open Pandora is only one way Nokia WON'T bring us anything interesting in foreseeable future. And, before anyone ask, N9 isn't interesting thing, to be honest :/