This is just reviewing what is currently available for mundane spying. The point is that nanotechnology is not needed for perfectly adequate spying on the average person.
More useful surveillance information can come from:
your phone records, online activity, credit cards and financial info. All of which can be easily tracked. Plus there are a billion camera phones and digital cameras already.
Below are some sites for commercially available spy gear.
These are covert listening devices or detection devices. Professional grade gear can cost $10,000. More expensive gear has higher quality microphones, more channels for recording, a writable optical drive for the recordings etc…
Brick house security
Spy associates blog
Buzzle editorial
Higher end audio surveillance gear is described
More from spy techs
Detection devices
Spy detection spy nyc
Other reading:
Satellite surveillance and the soon to be common gigapixel cameras
Government monitoring of cities
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
Known for identifying cutting edge technologies, he is currently a Co-Founder of a startup and fundraiser for high potential early-stage companies. He is the Head of Research for Allocations for deep technology investments and an Angel Investor at Space Angels.
A frequent speaker at corporations, he has been a TEDx speaker, a Singularity University speaker and guest at numerous interviews for radio and podcasts. He is open to public speaking and advising engagements.