Applications
These are a few examples of how Subni may be used...
Collaborate about shared Objects

First, an establishment or a regular customer tags a bar, cafe, or restaurant. The person adds the tag to Subni, specifies the tag to represent a "Cafe" type object. The cafe object contains metadata such as the name of cafe, the average price, location, and other useful pieces of data. When another Subni user scans this tag, they see all of the relevant information. After reading about the establishment, they may decide to visit. Afterwards, the customer can "bookmark" the cafe, in which they will write their thoughts about their interaction. If the bookmark is public, when the next user scans the cafe, they will not only see the metadata about the establishment, but relevant information from other people in their social network who have bookmarked the location.
Interactive and Intelligent Signs

As an example of how powerful the object definition can be, here is a useful and easy to implement example. A city registers a tag as a "Train Schedule Sign" object. This object contains information about the train and how often it comes. However, the city can also define the object to connect to another webservice, which will tell the user not just the metadata about the sign, but when the next train is coming. This gives an added layer of intelligence to everyday objects without embedding computers into these objects.
Interactive Invitations

A savvy web user knows e-vites are "so web 1.0" and decides to (snail) mail invitations to his party. However, each invitation is tagged as an "Calendar Event" object in Subni. So when his guests scan the tag, not only do they see the metadata about the party, but part of the object's definition allows the user to automatically add the event to his or her web calendar, automatically, using the web service's API.
Location and Context Aware Retail/Museum Environments

Imagine having the benefits of a real-life tour guide, the resources of the internet, and a notebook in one system. By tagging items for your customers or guests, you can provide them with not only a more powerful way to deliver metadata about items, but a new way to interact with the items. Guests can record which pieces or products they like the most. Museums and retailers can learn patterns in behaviour so that they may augment the layout of their real-world "artifacts".
Also read about SoundTagging for the Visually Impaired