How does tagging work?
Tags can be assigned per app from the 'Annotations' screen. An app can have any number (including none) of tags which must be separated from each other by a comma (spaces around commas will be stripped away and ignored). Tags effectively group apps. Their main purpose is to select a collection of apps from the main screen.
Care should be taken in choosing tag names. Tags that are too specific to group apps are as useless as tags that are so general that they group all apps. Here are some suggestions:
Apps that come free of charge.
Alternative to free.
Apps that bind into social networking services or general communication apps.
Apps that perform system level duties (e.g. backup, firewall, etc) and other utilties
Apps that are simply required to make the device usable/useful