"Twitter 360 is a new application specifically developed for the iPhone 3GS that enables you to visualize your Twitter friends located in your nearby environment, thanks to a unique Augmented Reality functionality using the iPhone camera.
Twitter 360 is one of the first iPhone applications to use the new Twitter's Geotagging feature to geotag your tweets. Please, note that Twitter 360 does not intend to be a fully Twitter client, our goal is to provide a different approach to the Twitter experience. We are already working on new ideas to be added in this application."
"In August  we announced that we were working on a new API that would provide developers with the ability to geotag tweets. Today, the Geotagging API is officially available.
This release is unique in that it's API–only which means you won't see any changes on twitter.com, yet. Instead, Twitter applications like Birdfeed, Seesmic Web, Foursquare, Gowalla, Twidroid, Twittelator Pro and others are already supporting this new functionality (go try them out now!) in interesting ways that include geotagging your tweets and displaying the location from where a tweet was posted. The added information provides valuable context when reading your friends tweets and allows you to better focus in on local conversations. Now you can find out what live music is playing right now in your neighborhood or what people visiting Checkpoint Charlie are saying today about the anniversary of the Berlin Wall. These are only the beginning and we are really looking forward to seeing the creative uses emerge from the developer community.
It's important to note geotagging is disabled by default for all users which means you will need to opt–in in order to use it. To activate the new geotagging functionality, go to your Settings page and click 'Enable Geotagging'."
(Twitter.com, 19 November 2009)
"Airwave1 is a complete GPS L1 receiver and it is the first product to benefit from Air's Always–On™ GPS technology.
Airwave1 is designed to support geotagging in digital cameras. To support this application, location information needs to be provided instantly when the user takes a photograph. With Airwave1 inside, the camera is continuously aware of its location and so it can immediately tag a photograph with its location – as soon as it is taken.
Airwave1 is a complete system for continuous location in cameras, comprising RF, analogue and digital signal processing hardware, a microprocessor and all embedded software necessary to provide a complete 'antenna to coordinates' solution in a single–chip."
(Air Semiconductor Inc.)
"Jabberwocky is a freely available mobile phone application designed to promote urban community connections and a sense of familiarity, anxiety, and play in public urban places. It takes advantage of current Bluetooth device proliferation. The application does not require seeding the population with initial users of the social network to function. Even today in most urban cities, the existence of even the current Bluetooth mobile phones is enough to gather meaningful and useful data for visualizations of place and urban strangers.The principle metaphors of Jabberwockies are "digital scents" and "digital tagging". As individuals traverse an urban landscape, they simply infuse their path with a unique and detectable digital redolence. Similarly, fixed places/objects can also emit unique "scents" once they are "digitally tagged" with small wireless tags called iMotes [...]. These scents and tags are localised and can be implemented easily using many of today's low power radios and personal wireless protocols such as Bluetooth."
You used to have 5 senses. Now you have 6. When you walked down the street you saw buildings and signs, but all traces of the thoughts of the millions of people who proceeded you had disappeared.As you consider these things, you snap a picture with your mobile phone and tag the spot where you stand. It goes into a trip grid called, "Last stand in London". You've just become the latest participant in redefining the real. You've just participated in the 6th sense of reality––Information Reality.