Yeah, the company I linked to did it before Intel released dual-core mobile Atoms.

I have two Atom desktop boards at home, one an older dual-core 330, the other a newer single-core D410. The D410 board is completely passively cooled. In the chassis I have it in, the main fan even shuts off if it's idle. I really need to get an SSD for it, so it's completely silent when idle. (Not to mention that might reduce the heat enough to keep the fan off under load.)