The usual suspects

Some concepts are not exactly wrong but simply unproportionally over-represented in current mainstream media partly because they carry the "nano" tag.

Overrepresented stuff

• utility fog
• grey goo
• molecular assemblers
• space elevator
• scary super-soldiers
• cloaking
• drug delivery for cancer
• toxicity of nano-particles
• nano medicine robots (more the fictional than the realistic ones)
• ...

Not atomically precise material sciences: (what's found when searching for the overladen term "nanotechnology").

• Lotus effect, Gecko feet, Sunscreen and the like
• diverse nano layers & carbon allotropes
• improvement of batteries through non/semi AP nanotechnology (increasement of surface area)
• quantum dots
• ...

Underrepresented stuff

• nanofactories
• advanced diamondoid metamaterials
• future upgraded street infrastructure
• effect of APM on civilization problems opportunities
• effect of APM on spaceflight
• nano medicine robots (more the realistic than the fictional ones)
• ... [and many more]