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.

Underrepresented stuff

• nanofactories
• advanced diamondoid metamaterials
• future upgraded street infrastructure
• effect of APM on civilization problems opportunities
• effect of APM on spaceflight
• ... [and many more]

Somewhat represented stuff

• utility fog
• nano medicine robots (more the realistic than the fictional ones)
• Origami

Overrepresented stuff

• grey goo
• molecular assemblers
• space elevator
• scary super-soldiers
• cloaking
• drug delivery for cancer (certainly not bad if overrepresented)
• toxicity of nano-particles
• ...

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
• ...