Large existing databases, such as WURFL may be useful as a starting point.
An OS/EE distinction could be that the OS version collects stats for us, calling back to a web service we could set up. A contained database and statistics might only be made available in the EE version.
(Restricted to icesoft-internal-developers group)

The component would collect statistics from the application client browsers and store a file database of detailed statistics. An optional admin charting view could also be made available.

The detected capabilities could then be exposed as variables for the application, so that components could adapt accordingly.

was:
Enhanced device capability detection would be very useful for enterprise developers. Creating mobile UIs is extremely challenging due to the variety browsers, view port sizes, CSS level, DOM API support, and device capabilities. The <mobi:deviceCapability> component would aim at simplifying this complexity by doing the following:

• automatically detect the following device capabilities
• platform and platform version
  ios
  android
  blackberry
  windows mobile
  desktop platforms (windows, osx, linux)
  others
• viewport size or category
  mobile
  small tablet
  large tablet
  desktop
• device pixel ratio
  low, medium, high
• CSS level
• HTML 5
• geolocation
• canvas
• other apis
• supported image types
• supported video codecs
• current data rate
  low, medium, high
• flash support
• pdf support

The component would collect statistics from the application client browsers and store a file database of detailed statistics. An optional admin charting view could also be made available.