The tiny, tiny radio

The World's Smallest Radio: Scientific American

Carbon nanotubes have already successfully been used as tiny radios, apparently. The implications:

The nanotube radio, its fabricators say, could be the basis for a range of revolutionary applications: hearing aids, cell phones and ­iPods small enough to fit completely within the ear canal. The nanoradio “would easily fit inside a living cell,” Zettl says. “One can envision interfaces to brain or muscle functions or radio-controlled devices moving through the bloodstream.”

I'm not entirely sure what the memory of an ear canal iPod would be based on, but it's a neat science fiction-y idea.

I like the first comment after the story:

Now the tinfoil hat battalions have something new to worry about; never mind the "implant that the ___ put in to control my brain", they can now fantasize about receiving nanoradio control devices from every vaccination or blood test!