UPDATE - January 2010  - 

The major cable MSOs have begun deploying EBIF in selected markets, with Comcast's Brian Roberts recently reporting that 13 million STB are now EBIF-enabled (via the TV Works User Agent).  Other MSOs are also enabling their STBs with EBIF and beginning field trials.

For 3rd party developers, it would appear that 2010 and beyond are the years which will see new types of Unbound (and Bound) EBIF applications emerging.

More on this as headlines and time permit.