[Wear-Hard] Passive Uses For Your Wearable

[tetsu yatsu]

I thought this topic deserved it's own thread.

What passive uses/interfaces can you all think of (or currently know
of/use) for a wearable? For those without an adequate input device,
this could keep us on track after the novelty of hacking a monocle
into a pair of safety glasses wears off. There are also moments you
won't want to focus on keying/typing your thoughts, but are still
wasting valuable processor cycles and power that could give you a
little bit of information.

Passive Inputs:
Camera
GPS
Audio
Magnetic Sensor
Tilt Sensors
Network Connectivity
Radio
Temperature Measures
Luminosity Measures
Hygrometer Measures
[add more if you think of any]

Passive Uses:
GPGPU/OpenVidia like image processing and overlay
Geolocational relevant data from network sources or device cache
Persistent audio recording/tagging/file splitting
Twitter updates (with whatever data you can get without a keyer)
Magnetic Sensor readings - just because it's fun.
IR Viewer - see the world in infrared, it sounds so cool!
Passively Sniff Ambient Network Traffic - see the EEBBCD's of SMB's
broadcast messages!
Scan Local EM Sources with radio - there was a project on
we-make-money-not-art about this some time ago
Record Video Everywhere - storage-resource intensive
Sousveillance - it's what we're here for, according to some
Ambient Sensors - when someone says 'its hot in here', or 'it's really
bright out', have a Real answer :)
Relevant Information Database Lookups - based on what information is
available, a list of Most Likely relevant information (PageRank
sorted?)


I've also been getting into Machine Learning at my job, so I see a lot
of neat applications with that. (Take every input source as
attributes, train a classifier to classify relevant information,
display that.)

Suggestions, comments?